625008553923781 has 16 divisors (see below), whose sum is σ = 638748512262000. Its totient is φ = 611341394646528.

The previous prime is 625008553923749. The next prime is 625008553923791. The reversal of 625008553923781 is 187329355800526.

625008553923781 = 17677790² + 17677791².

It can be written as a sum of positive squares in 8 ways, for example, as 226943408458881 + 398065145464900 = 15064641^2 + 19951570^2 .

It is a cyclic number.

It is not a de Polignac number, because 625008553923781 - 2⁵ = 625008553923749 is a prime.

It is a super-2 number, since 2×625008553923781² (a number of 30 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 (625008553923701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93107475 + ... + 99594271.

It is an arithmetic number, because the mean of its divisors is an integer number (39921782016375).

Almost surely, 2^{625008553923781} is an apocalyptic number.

625008553923781 is the 17677791-st centered square number and also the 15811497-th centered pentagonal number.

It is an amenable number.

625008553923781 is a deficient number, since it is larger than the sum of its proper divisors (13739958338219).

625008553923781 is a wasteful number, since it uses less digits than its factorization.

625008553923781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6492408.

The product of its (nonzero) digits is 108864000, while the sum is 64.

The spelling of 625008553923781 in words is "six hundred twenty-five trillion, eight billion, five hundred fifty-three million, nine hundred twenty-three thousand, seven hundred eighty-one".