511161551021 has 8 divisors (see below), whose sum is σ = 575618873088. Its totient is φ = 449702244000.

The previous prime is 511161550987. The next prime is 511161551057. The reversal of 511161551021 is 120155161115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-511161551021 is a prime.

It is a super-2 number, since 2×511161551021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511161551821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 749503400 + ... + 749504081.

It is an arithmetic number, because the mean of its divisors is an integer number (71952359136).

Almost surely, 2^511161551021 is an apocalyptic number.

It is an amenable number.

511161551021 is a deficient number, since it is larger than the sum of its proper divisors (64457322067).

511161551021 is a wasteful number, since it uses less digits than its factorization.

511161551021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499007523.

The product of its (nonzero) digits is 1500, while the sum is 29.

The spelling of 511161551021 in words is "five hundred eleven billion, one hundred sixty-one million, five hundred fifty-one thousand, twenty-one".