51866664 has 32 divisors (see below), whose sum is σ = 131868000. Its totient is φ = 16995392.

The previous prime is 51866663. The next prime is 51866747. The reversal of 51866664 is 46666815.

It is not an unprimeable number, because it can be changed into a prime (51866663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16899 + ... + 19730.

It is an arithmetic number, because the mean of its divisors is an integer number (4120875).

Almost surely, 2^51866664 is an apocalyptic number.

It is an amenable number.

51866664 is an abundant number, since it is smaller than the sum of its proper divisors (80001336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51866664 is a wasteful number, since it uses less digits than its factorization.

51866664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36697 (or 36693 counting only the distinct ones).

The product of its digits is 207360, while the sum is 42.

The square root of 51866664 is about 7201.8514286258. The cubic root of 51866664 is about 372.9318181888.

The spelling of 51866664 in words is "fifty-one million, eight hundred sixty-six thousand, six hundred sixty-four".