65986280761657 has 2 divisors, whose sum is σ = 65986280761658. Its totient is φ = 65986280761656.

The previous prime is 65986280761559. The next prime is 65986280761663. The reversal of 65986280761657 is 75616708268956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40735846711296 + 25250434050361 = 6382464^2 + 5024981^2 .

It is a cyclic number.

It is not a de Polignac number, because 65986280761657 - 2⁴³ = 57190187739449 is a prime.

It is not a weakly prime, because it can be changed into another prime (65986280761697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32993140380828 + 32993140380829.

It is an arithmetic number, because the mean of its divisors is an integer number (32993140380829).

Almost surely, 2^{65986280761657} is an apocalyptic number.

It is an amenable number.

65986280761657 is a deficient number, since it is larger than the sum of its proper divisors (1).

65986280761657 is an equidigital number, since it uses as much as digits as its factorization.

65986280761657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1828915200, while the sum is 76.

The spelling of 65986280761657 in words is "sixty-five trillion, nine hundred eighty-six billion, two hundred eighty million, seven hundred sixty-one thousand, six hundred fifty-seven".