251516040466 has 8 divisors (see below), whose sum is σ = 377471282364. Its totient is φ = 125692279680.

The previous prime is 251516040427. The next prime is 251516040467. The reversal of 251516040466 is 664040615152.

It can be written as a sum of positive squares in 2 ways, for example, as 250085007225 + 1431033241 = 500085^2 + 37829^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×251516040466² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251516040467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32865495 + ... + 32873146.

Almost surely, 2^251516040466 is an apocalyptic number.

251516040466 is a deficient number, since it is larger than the sum of its proper divisors (125955241898).

251516040466 is a wasteful number, since it uses less digits than its factorization.

251516040466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65740556.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 251516040466 in words is "two hundred fifty-one billion, five hundred sixteen million, forty thousand, four hundred sixty-six".