66402011657 has 2 divisors, whose sum is σ = 66402011658. Its totient is φ = 66402011656.

The previous prime is 66402011551. The next prime is 66402011707. The reversal of 66402011657 is 75611020466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63151187401 + 3250824256 = 251299^2 + 57016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66402011657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66402011657.

It is not a weakly prime, because it can be changed into another prime (66402011257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33201005828 + 33201005829.

It is an arithmetic number, because the mean of its divisors is an integer number (33201005829).

Almost surely, 2^66402011657 is an apocalyptic number.

It is an amenable number.

66402011657 is a deficient number, since it is larger than the sum of its proper divisors (1).

66402011657 is an equidigital number, since it uses as much as digits as its factorization.

66402011657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 66402011657 in words is "sixty-six billion, four hundred two million, eleven thousand, six hundred fifty-seven".