66013070657 has 2 divisors, whose sum is σ = 66013070658. Its totient is φ = 66013070656.

The previous prime is 66013070633. The next prime is 66013070699. The reversal of 66013070657 is 75607031066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61488624961 + 4524445696 = 247969^2 + 67264^2 .

It is a cyclic number.

It is not a de Polignac number, because 66013070657 - 2¹⁸ = 66012808513 is a prime.

It is not a weakly prime, because it can be changed into another prime (66013970657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33006535328 + 33006535329.

It is an arithmetic number, because the mean of its divisors is an integer number (33006535329).

Almost surely, 2^66013070657 is an apocalyptic number.

It is an amenable number.

66013070657 is a deficient number, since it is larger than the sum of its proper divisors (1).

66013070657 is an equidigital number, since it uses as much as digits as its factorization.

66013070657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 41.

The spelling of 66013070657 in words is "sixty-six billion, thirteen million, seventy thousand, six hundred fifty-seven".