251940068235 has 12 divisors (see below), whose sum is σ = 436696118352. Its totient is φ = 134368036368.

The previous prime is 251940068213. The next prime is 251940068251. The reversal of 251940068235 is 532860049152.

251940068235 is a `hidden beast` number, since 2 + 5 + 1 + 9 + 400 + 6 + 8 + 235 = 666.

It is not a de Polignac number, because 251940068235 - 2¹² = 251940064139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 5598668183 = 251940068235 / (2 + 5 + 1 + 9 + 4 + 0 + 0 + 6 + 8 + 2 + 3 + 5).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2799334047 + ... + 2799334136.

It is an arithmetic number, because the mean of its divisors is an integer number (36391343196).

Almost surely, 2^251940068235 is an apocalyptic number.

251940068235 is a deficient number, since it is larger than the sum of its proper divisors (184756050117).

251940068235 is a wasteful number, since it uses less digits than its factorization.

251940068235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5598668194 (or 5598668191 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 251940068235 in words is "two hundred fifty-one billion, nine hundred forty million, sixty-eight thousand, two hundred thirty-five".