51556664 has 48 divisors (see below), whose sum is σ = 102429600. Its totient is φ = 24321024.

The previous prime is 51556663. The next prime is 51556667. The reversal of 51556664 is 46665515.

Its product of digits (108000) is a multiple of the sum of its prime factors (240).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51556663) 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 in 11 ways as a sum of consecutive naturals, for example, 531464 + ... + 531560.

It is an arithmetic number, because the mean of its divisors is an integer number (2133950).

Almost surely, 2^51556664 is an apocalyptic number.

It is an amenable number.

51556664 is a deficient number, since it is larger than the sum of its proper divisors (50872936).

51556664 is a wasteful number, since it uses less digits than its factorization.

51556664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240 (or 207 counting only the distinct ones).

The product of its digits is 108000, while the sum is 38.

The square root of 51556664 is about 7180.2969297934. The cubic root of 51556664 is about 372.1873454150.

The spelling of 51556664 in words is "fifty-one million, five hundred fifty-six thousand, six hundred sixty-four".