51172666 has 32 divisors (see below), whose sum is σ = 81544320. Its totient is φ = 24058944.

The previous prime is 51172663. The next prime is 51172679. The reversal of 51172666 is 66627115.

It is a happy number.

51172666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (51172663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 469420 + ... + 469528.

It is an arithmetic number, because the mean of its divisors is an integer number (2548260).

Almost surely, 2^51172666 is an apocalyptic number.

51172666 is a deficient number, since it is larger than the sum of its proper divisors (30371654).

51172666 is a wasteful number, since it uses less digits than its factorization.

51172666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310.

The product of its digits is 15120, while the sum is 34.

The square root of 51172666 is about 7153.5072516913. The cubic root of 51172666 is about 371.2610151402.

The spelling of 51172666 in words is "fifty-one million, one hundred seventy-two thousand, six hundred sixty-six".