511121465641 has 4 divisors (see below), whose sum is σ = 511377925972. Its totient is φ = 510865005312.

The previous prime is 511121465629. The next prime is 511121465653. The reversal of 511121465641 is 146564121115.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (511121465629) and next prime (511121465653).

It can be written as a sum of positive squares in 2 ways, for example, as 378989215641 + 132132250000 = 615621^2 + 363500^2 .

It is a cyclic number.

It is not a de Polignac number, because 511121465641 - 2³⁷ = 373682512169 is a prime.

It is a super-2 number, since 2×511121465641² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 511121465641.

It is not an unprimeable number, because it can be changed into a prime (511121465441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128227176 + ... + 128231161.

It is an arithmetic number, because the mean of its divisors is an integer number (127844481493).

Almost surely, 2^511121465641 is an apocalyptic number.

It is an amenable number.

511121465641 is a deficient number, since it is larger than the sum of its proper divisors (256460331).

511121465641 is a wasteful number, since it uses less digits than its factorization.

511121465641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256460330.

The product of its digits is 28800, while the sum is 37.

Adding to 511121465641 its reverse (146564121115), we get a palindrome (657685586756).

The spelling of 511121465641 in words is "five hundred eleven billion, one hundred twenty-one million, four hundred sixty-five thousand, six hundred forty-one".