511216065581 has 8 divisors (see below), whose sum is σ = 550553431680. Its totient is φ = 471880564272.

The previous prime is 511216065533. The next prime is 511216065589. The reversal of 511216065581 is 185560612115.

It is a happy number.

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-511216065581 is a prime.

It is a super-2 number, since 2×511216065581² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511216065589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131576 + ... + 1019678.

It is an arithmetic number, because the mean of its divisors is an integer number (68819178960).

Almost surely, 2^511216065581 is an apocalyptic number.

It is an amenable number.

511216065581 is a deficient number, since it is larger than the sum of its proper divisors (39337366099).

511216065581 is a wasteful number, since it uses less digits than its factorization.

511216065581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932395.

The product of its (nonzero) digits is 72000, while the sum is 41.

Adding to 511216065581 its reverse (185560612115), we get a palindrome (696776677696).

The spelling of 511216065581 in words is "five hundred eleven billion, two hundred sixteen million, sixty-five thousand, five hundred eighty-one".