63277645657 has 18 divisors (see below), whose sum is σ = 67199873982. Its totient is φ = 59574057984.

The previous prime is 63277645637. The next prime is 63277645661. The reversal of 63277645657 is 75654677236.

It can be written as a sum of positive squares in 3 ways, for example, as 1883212816 + 61394432841 = 43396^2 + 247779^2 .

It is a de Polignac number, because none of the positive numbers 2^k-63277645657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63277645637) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 66397893 + ... + 66398845.

Almost surely, 2^63277645657 is an apocalyptic number.

It is an amenable number.

63277645657 is a deficient number, since it is larger than the sum of its proper divisors (3922228325).

63277645657 is an frugal number, since it uses more digits than its factorization.

63277645657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2137 (or 1165 counting only the distinct ones).

The product of its digits is 44452800, while the sum is 58.

The spelling of 63277645657 in words is "sixty-three billion, two hundred seventy-seven million, six hundred forty-five thousand, six hundred fifty-seven".