56664665 has 16 divisors (see below), whose sum is σ = 69987456. Its totient is φ = 44016000.

The previous prime is 56664661. The next prime is 56664667. The reversal of 56664665 is 56646665.

It is not a de Polignac number, because 56664665 - 2² = 56664661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56664661) 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 15 ways as a sum of consecutive naturals, for example, 53390 + ... + 54440.

It is an arithmetic number, because the mean of its divisors is an integer number (4374216).

Almost surely, 2^56664665 is an apocalyptic number.

It is an amenable number.

56664665 is a deficient number, since it is larger than the sum of its proper divisors (13322791).

56664665 is a wasteful number, since it uses less digits than its factorization.

56664665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360.

The product of its digits is 777600, while the sum is 44.

The square root of 56664665 is about 7527.5935729820. The cubic root of 56664665 is about 384.0939282128.

The spelling of 56664665 in words is "fifty-six million, six hundred sixty-four thousand, six hundred sixty-five".