251006555957 has 2 divisors, whose sum is σ = 251006555958. Its totient is φ = 251006555956.

The previous prime is 251006555881. The next prime is 251006556161. The reversal of 251006555957 is 759555600152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 251002002001 + 4553956 = 501001^2 + 2134^2 .

It is a cyclic number.

It is not a de Polignac number, because 251006555957 - 2¹⁶ = 251006490421 is a prime.

It is a super-2 number, since 2×251006555957² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251006554957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125503277978 + 125503277979.

It is an arithmetic number, because the mean of its divisors is an integer number (125503277979).

Almost surely, 2^251006555957 is an apocalyptic number.

It is an amenable number.

251006555957 is a deficient number, since it is larger than the sum of its proper divisors (1).

251006555957 is an equidigital number, since it uses as much as digits as its factorization.

251006555957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2362500, while the sum is 50.

The spelling of 251006555957 in words is "two hundred fifty-one billion, six million, five hundred fifty-five thousand, nine hundred fifty-seven".