625453918657 has 2 divisors, whose sum is σ = 625453918658. Its totient is φ = 625453918656.

The previous prime is 625453918633. The next prime is 625453918699. The reversal of 625453918657 is 756819354526.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 614845742641 + 10608176016 = 784121^2 + 102996^2 .

It is a cyclic number.

It is not a de Polignac number, because 625453918657 - 2¹⁹ = 625453394369 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 625453918595 and 625453918604.

It is not a weakly prime, because it can be changed into another prime (625453018657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312726959328 + 312726959329.

It is an arithmetic number, because the mean of its divisors is an integer number (312726959329).

Almost surely, 2^625453918657 is an apocalyptic number.

It is an amenable number.

625453918657 is a deficient number, since it is larger than the sum of its proper divisors (1).

625453918657 is an equidigital number, since it uses as much as digits as its factorization.

625453918657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432000, while the sum is 61.

The spelling of 625453918657 in words is "six hundred twenty-five billion, four hundred fifty-three million, nine hundred eighteen thousand, six hundred fifty-seven".