66733400677 has 2 divisors, whose sum is σ = 66733400678. Its totient is φ = 66733400676.

The previous prime is 66733400653. The next prime is 66733400711. The reversal of 66733400677 is 77600433766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53861590561 + 12871810116 = 232081^2 + 113454^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66733400677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66733400677.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66733400477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33366700338 + 33366700339.

It is an arithmetic number, because the mean of its divisors is an integer number (33366700339).

Almost surely, 2^66733400677 is an apocalyptic number.

It is an amenable number.

66733400677 is a deficient number, since it is larger than the sum of its proper divisors (1).

66733400677 is an equidigital number, since it uses as much as digits as its factorization.

66733400677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2667168, while the sum is 49.

The spelling of 66733400677 in words is "sixty-six billion, seven hundred thirty-three million, four hundred thousand, six hundred seventy-seven".