66372881651999 has 32 divisors (see below), whose sum is σ = 72411245222400. Its totient is φ = 60470324766720.

The previous prime is 66372881651971. The next prime is 66372881652001. The reversal of 66372881651999 is 99915618827366.

It is a cyclic number.

It is not a de Polignac number, because 66372881651999 - 2³² = 66368586684703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66372881651929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1731643067 + ... + 1731681395.

It is an arithmetic number, because the mean of its divisors is an integer number (2262851413200).

Almost surely, 2^{66372881651999} is an apocalyptic number.

66372881651999 is a deficient number, since it is larger than the sum of its proper divisors (6038363570401).

66372881651999 is a wasteful number, since it uses less digits than its factorization.

66372881651999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41075.

The product of its digits is 2116316160, while the sum is 80.

The spelling of 66372881651999 in words is "sixty-six trillion, three hundred seventy-two billion, eight hundred eighty-one million, six hundred fifty-one thousand, nine hundred ninety-nine".