249791863761 has 24 divisors (see below), whose sum is σ = 404249574144. Its totient is φ = 147297411360.

The previous prime is 249791863757. The next prime is 249791863787. The reversal of 249791863761 is 167368197942.

249791863761 is a `hidden beast` number, since 2 + 497 + 9 + 1 + 86 + 3 + 7 + 61 = 666.

It is not a de Polignac number, because 249791863761 - 2² = 249791863757 is a prime.

It is not an unprimeable number, because it can be changed into a prime (249791864761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34092961 + ... + 34100286.

It is an arithmetic number, because the mean of its divisors is an integer number (16843732256).

Almost surely, 2^249791863761 is an apocalyptic number.

It is an amenable number.

249791863761 is a deficient number, since it is larger than the sum of its proper divisors (154457710383).

249791863761 is a wasteful number, since it uses less digits than its factorization.

249791863761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68193301 (or 68193298 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 63.

The spelling of 249791863761 in words is "two hundred forty-nine billion, seven hundred ninety-one million, eight hundred sixty-three thousand, seven hundred sixty-one".