66465401257 has 2 divisors, whose sum is σ = 66465401258. Its totient is φ = 66465401256.

The previous prime is 66465401251. The next prime is 66465401287. The reversal of 66465401257 is 75210456466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53204496921 + 13260904336 = 230661^2 + 115156^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66465401257 is a prime.

It is not a weakly prime, because it can be changed into another prime (66465401251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33232700628 + 33232700629.

It is an arithmetic number, because the mean of its divisors is an integer number (33232700629).

Almost surely, 2^66465401257 is an apocalyptic number.

It is an amenable number.

66465401257 is a deficient number, since it is larger than the sum of its proper divisors (1).

66465401257 is an equidigital number, since it uses as much as digits as its factorization.

66465401257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 46.

The spelling of 66465401257 in words is "sixty-six billion, four hundred sixty-five million, four hundred one thousand, two hundred fifty-seven".