64772756461 has 6 divisors (see below), whose sum is σ = 75347900430. Its totient is φ = 55519505496.

The previous prime is 64772756459. The next prime is 64772756497. The reversal of 64772756461 is 16465727746.

It can be written as a sum of positive squares in only one way, i.e., 37643372361 + 27129384100 = 194019^2 + 164710^2 .

It is not a de Polignac number, because 64772756461 - 2¹ = 64772756459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64772757461) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 660946446 + ... + 660946543.

It is an arithmetic number, because the mean of its divisors is an integer number (12557983405).

Almost surely, 2^64772756461 is an apocalyptic number.

It is an amenable number.

64772756461 is a deficient number, since it is larger than the sum of its proper divisors (10575143969).

64772756461 is a wasteful number, since it uses less digits than its factorization.

64772756461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321893003 (or 1321892996 counting only the distinct ones).

The product of its digits is 11854080, while the sum is 55.

The spelling of 64772756461 in words is "sixty-four billion, seven hundred seventy-two million, seven hundred fifty-six thousand, four hundred sixty-one".