66566552390 has 32 divisors (see below), whose sum is σ = 134646998976. Its totient is φ = 23509791360.

The previous prime is 66566552389. The next prime is 66566552419. The reversal of 66566552390 is 9325566566.

It is a happy number.

It is a super-2 number, since 2×66566552390² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11128541 + ... + 11134520.

It is an arithmetic number, because the mean of its divisors is an integer number (4207718718).

Almost surely, 2^66566552390 is an apocalyptic number.

66566552390 is an abundant number, since it is smaller than the sum of its proper divisors (68080446586).

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

66566552390 is a wasteful number, since it uses less digits than its factorization.

66566552390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22263104.

The product of its (nonzero) digits is 8748000, while the sum is 53.

The spelling of 66566552390 in words is "sixty-six billion, five hundred sixty-six million, five hundred fifty-two thousand, three hundred ninety".