56215520066 has 16 divisors (see below), whose sum is σ = 89314834680. Its totient is φ = 26445070080.

The previous prime is 56215520057. The next prime is 56215520069. The reversal of 56215520066 is 66002551265.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 41069049025 + 15146471041 = 202655^2 + 123071^2 .

It is not an unprimeable number, because it can be changed into a prime (56215520069) 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, 191681 + ... + 386228.

Almost surely, 2^56215520066 is an apocalyptic number.

56215520066 is a deficient number, since it is larger than the sum of its proper divisors (33099314614).

56215520066 is a wasteful number, since it uses less digits than its factorization.

56215520066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580789.

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

The spelling of 56215520066 in words is "fifty-six billion, two hundred fifteen million, five hundred twenty thousand, sixty-six".