25051560455561 has 2 divisors, whose sum is σ = 25051560455562. Its totient is φ = 25051560455560.

The previous prime is 25051560455501. The next prime is 25051560455591. The reversal of 25051560455561 is 16555406515052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22183723201600 + 2867837253961 = 4709960^2 + 1693469^2 .

It is a cyclic number.

It is not a de Polignac number, because 25051560455561 - 2⁶ = 25051560455497 is a prime.

It is not a weakly prime, because it can be changed into another prime (25051560455501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12525780227780 + 12525780227781.

It is an arithmetic number, because the mean of its divisors is an integer number (12525780227781).

Almost surely, 2^{25051560455561} is an apocalyptic number.

It is an amenable number.

25051560455561 is a deficient number, since it is larger than the sum of its proper divisors (1).

25051560455561 is an equidigital number, since it uses as much as digits as its factorization.

25051560455561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500000, while the sum is 50.

The spelling of 25051560455561 in words is "twenty-five trillion, fifty-one billion, five hundred sixty million, four hundred fifty-five thousand, five hundred sixty-one".