5256164516781 has 32 divisors (see below), whose sum is σ = 7110548812800. Its totient is φ = 3453322118400.

The previous prime is 5256164516749. The next prime is 5256164516789. The reversal of 5256164516781 is 1876154616525.

It is a happy number.

It is not a de Polignac number, because 5256164516781 - 2⁵ = 5256164516749 is a prime.

It is a super-2 number, since 2×5256164516781² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5256164516789) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103257346 + ... + 103308236.

It is an arithmetic number, because the mean of its divisors is an integer number (222204650400).

Almost surely, 2^{5256164516781} is an apocalyptic number.

It is an amenable number.

5256164516781 is a deficient number, since it is larger than the sum of its proper divisors (1854384296019).

5256164516781 is a wasteful number, since it uses less digits than its factorization.

5256164516781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52737.

The product of its digits is 12096000, while the sum is 57.

The spelling of 5256164516781 in words is "five trillion, two hundred fifty-six billion, one hundred sixty-four million, five hundred sixteen thousand, seven hundred eighty-one".