251163494604 has 216 divisors, whose sum is σ = 762999252288. Its totient is φ = 71632200960.

The previous prime is 251163494599. The next prime is 251163494717. The reversal of 251163494604 is 406494361152.

251163494604 is a `hidden beast` number, since 2 + 5 + 1 + 1 + 6 + 34 + 9 + 4 + 604 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 251163494604.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3049347 + ... + 3130629.

Almost surely, 2^251163494604 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251163494604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (381499626144).

251163494604 is an abundant number, since it is smaller than the sum of its proper divisors (511835757684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251163494604 is a wasteful number, since it uses less digits than its factorization.

251163494604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81347 (or 81316 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 251163494604 in words is "two hundred fifty-one billion, one hundred sixty-three million, four hundred ninety-four thousand, six hundred four".