51313666 has 8 divisors (see below), whose sum is σ = 77193360. Its totient is φ = 25582548.

The previous prime is 51313643. The next prime is 51313697. The reversal of 51313666 is 66631315.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36276 + ... + 37663.

It is an arithmetic number, because the mean of its divisors is an integer number (9649170).

Almost surely, 2^51313666 is an apocalyptic number.

51313666 is a deficient number, since it is larger than the sum of its proper divisors (25879694).

51313666 is a wasteful number, since it uses less digits than its factorization.

51313666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74288.

The product of its digits is 9720, while the sum is 31.

The square root of 51313666 is about 7163.3557778460. The cubic root of 51313666 is about 371.6016904875.

The spelling of 51313666 in words is "fifty-one million, three hundred thirteen thousand, six hundred sixty-six".