66737440997 has 2 divisors, whose sum is σ = 66737440998. Its totient is φ = 66737440996.

The previous prime is 66737440981. The next prime is 66737441021. The reversal of 66737440997 is 79904473766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63770895841 + 2966545156 = 252529^2 + 54466^2 .

It is a cyclic number.

It is not a de Polignac number, because 66737440997 - 2⁴ = 66737440981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66737440697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33368720498 + 33368720499.

It is an arithmetic number, because the mean of its divisors is an integer number (33368720499).

Almost surely, 2^66737440997 is an apocalyptic number.

It is an amenable number.

66737440997 is a deficient number, since it is larger than the sum of its proper divisors (1).

66737440997 is an equidigital number, since it uses as much as digits as its factorization.

66737440997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48009024, while the sum is 62.

The spelling of 66737440997 in words is "sixty-six billion, seven hundred thirty-seven million, four hundred forty thousand, nine hundred ninety-seven".