66366506446644 has 48 divisors (see below), whose sum is σ = 158241233058048. Its totient is φ = 21638990410368.

The previous prime is 66366506446609. The next prime is 66366506446649. The reversal of 66366506446644 is 44664460566366.

It is a super-2 number, since 2×66366506446644² (a number of 28 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66366506446649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32972707 + ... + 34927530.

It is an arithmetic number, because the mean of its divisors is an integer number (3296692355376).

Almost surely, 2^{66366506446644} is an apocalyptic number.

It is an amenable number.

66366506446644 is an abundant number, since it is smaller than the sum of its proper divisors (91874726611404).

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

66366506446644 is a wasteful number, since it uses less digits than its factorization.

66366506446644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67902024 (or 67902022 counting only the distinct ones).

The product of its (nonzero) digits is 1074954240, while the sum is 66.

The spelling of 66366506446644 in words is "sixty-six trillion, three hundred sixty-six billion, five hundred six million, four hundred forty-six thousand, six hundred forty-four".