66216372701 has 2 divisors, whose sum is σ = 66216372702. Its totient is φ = 66216372700.

The previous prime is 66216372697. The next prime is 66216372749. The reversal of 66216372701 is 10727361266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45517795801 + 20698576900 = 213349^2 + 143870^2 .

It is a cyclic number.

It is not a de Polignac number, because 66216372701 - 2² = 66216372697 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66216372791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33108186350 + 33108186351.

It is an arithmetic number, because the mean of its divisors is an integer number (33108186351).

Almost surely, 2^66216372701 is an apocalyptic number.

It is an amenable number.

66216372701 is a deficient number, since it is larger than the sum of its proper divisors (1).

66216372701 is an equidigital number, since it uses as much as digits as its factorization.

66216372701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 41.

The spelling of 66216372701 in words is "sixty-six billion, two hundred sixteen million, three hundred seventy-two thousand, seven hundred one".