251871161530 has 32 divisors (see below), whose sum is σ = 466515346320. Its totient is φ = 97837309440.

The previous prime is 251871161497. The next prime is 251871161533. The reversal of 251871161530 is 35161178152.

It can be written as a sum of positive squares in 8 ways, for example, as 144081735561 + 107789425969 = 379581^2 + 328313^2 .

It is not an unprimeable number, because it can be changed into a prime (251871161533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 460525 + ... + 846064.

Almost surely, 2^251871161530 is an apocalyptic number.

251871161530 is a deficient number, since it is larger than the sum of its proper divisors (214644184790).

251871161530 is a wasteful number, since it uses less digits than its factorization.

251871161530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307154.

The product of its (nonzero) digits is 50400, while the sum is 40.

The spelling of 251871161530 in words is "two hundred fifty-one billion, eight hundred seventy-one million, one hundred sixty-one thousand, five hundred thirty".