51660706 has 4 divisors (see below), whose sum is σ = 77491062. Its totient is φ = 25830352.

The previous prime is 51660703. The next prime is 51660727. The reversal of 51660706 is 60706615.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 51624225 + 36481 = 7185^2 + 191^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (51660701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12915175 + ... + 12915178.

Almost surely, 2^51660706 is an apocalyptic number.

51660706 is a deficient number, since it is larger than the sum of its proper divisors (25830356).

51660706 is a wasteful number, since it uses less digits than its factorization.

51660706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25830355.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 51660706 is about 7187.5382433765. The cubic root of 51660706 is about 372.4375367840.

The spelling of 51660706 in words is "fifty-one million, six hundred sixty thousand, seven hundred six".