511625860681 has 12 divisors (see below), whose sum is σ = 556491117196. Its totient is φ = 467593963200.

The previous prime is 511625860679. The next prime is 511625860687. The reversal of 511625860681 is 186068526115.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 139872260025 + 371753600656 = 373995^2 + 609716^2 .

It is not a de Polignac number, because 511625860681 - 2¹ = 511625860679 is a prime.

It is a super-2 number, since 2×511625860681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (511625860687) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1796406 + ... + 2061631.

Almost surely, 2^511625860681 is an apocalyptic number.

It is an amenable number.

511625860681 is a deficient number, since it is larger than the sum of its proper divisors (44865256515).

511625860681 is a wasteful number, since it uses less digits than its factorization.

511625860681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3858252 (or 3858151 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 49.

The spelling of 511625860681 in words is "five hundred eleven billion, six hundred twenty-five million, eight hundred sixty thousand, six hundred eighty-one".