625102554011561 has 2 divisors, whose sum is σ = 625102554011562. Its totient is φ = 625102554011560.

The previous prime is 625102554011491. The next prime is 625102554011633. The reversal of 625102554011561 is 165110455201526.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 405157518675625 + 219945035335936 = 20128525^2 + 14830544^2 .

It is a cyclic number.

It is not a de Polignac number, because 625102554011561 - 2¹⁸ = 625102553749417 is a prime.

It is not a weakly prime, because it can be changed into another prime (625102554011861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312551277005780 + 312551277005781.

It is an arithmetic number, because the mean of its divisors is an integer number (312551277005781).

Almost surely, 2^{625102554011561} is an apocalyptic number.

It is an amenable number.

625102554011561 is a deficient number, since it is larger than the sum of its proper divisors (1).

625102554011561 is an equidigital number, since it uses as much as digits as its factorization.

625102554011561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360000, while the sum is 44.

The spelling of 625102554011561 in words is "six hundred twenty-five trillion, one hundred two billion, five hundred fifty-four million, eleven thousand, five hundred sixty-one".