253561425991 has 2 divisors, whose sum is σ = 253561425992. Its totient is φ = 253561425990.

The previous prime is 253561425977. The next prime is 253561426031. The reversal of 253561425991 is 199524165352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 253561425991 - 2⁵ = 253561425959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253561425191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126780712995 + 126780712996.

It is an arithmetic number, because the mean of its divisors is an integer number (126780712996).

Almost surely, 2^253561425991 is an apocalyptic number.

253561425991 is a deficient number, since it is larger than the sum of its proper divisors (1).

253561425991 is an equidigital number, since it uses as much as digits as its factorization.

253561425991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916000, while the sum is 52.

The spelling of 253561425991 in words is "two hundred fifty-three billion, five hundred sixty-one million, four hundred twenty-five thousand, nine hundred ninety-one".