251478757803 has 96 divisors (see below), whose sum is σ = 427335744000. Its totient is φ = 131421273984.

The previous prime is 251478757769. The next prime is 251478757811. The reversal of 251478757803 is 308757874152.

It is not a de Polignac number, because 251478757803 - 2⁹ = 251478757291 is a prime.

It is a super-2 number, since 2×251478757803² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251478757813) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 18948576 + ... + 18961842.

It is an arithmetic number, because the mean of its divisors is an integer number (4451414000).

Almost surely, 2^251478757803 is an apocalyptic number.

251478757803 is a deficient number, since it is larger than the sum of its proper divisors (175856986197).

251478757803 is a wasteful number, since it uses less digits than its factorization.

251478757803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13426 (or 13399 counting only the distinct ones).

The product of its (nonzero) digits is 13171200, while the sum is 57.

The spelling of 251478757803 in words is "two hundred fifty-one billion, four hundred seventy-eight million, seven hundred fifty-seven thousand, eight hundred three".