251261602099 has 2 divisors, whose sum is σ = 251261602100. Its totient is φ = 251261602098.

The previous prime is 251261602091. The next prime is 251261602121. The reversal of 251261602099 is 990206162152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251261602099 - 2³ = 251261602091 is a prime.

It is not a weakly prime, because it can be changed into another prime (251261602091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125630801049 + 125630801050.

It is an arithmetic number, because the mean of its divisors is an integer number (125630801050).

Almost surely, 2^251261602099 is an apocalyptic number.

251261602099 is a deficient number, since it is larger than the sum of its proper divisors (1).

251261602099 is an equidigital number, since it uses as much as digits as its factorization.

251261602099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 43.

The spelling of 251261602099 in words is "two hundred fifty-one billion, two hundred sixty-one million, six hundred two thousand, ninety-nine".