64932722761 has 27 divisors (see below), whose sum is σ = 68393272437. Its totient is φ = 61645812480.

The previous prime is 64932722731. The next prime is 64932722783. The reversal of 64932722761 is 16722723946.

The square root of 64932722761 is 254819.

It is a perfect power (a square), and thus also a powerful number.

64932722761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 10036232761 + 54896490000 = 100181^2 + 234300^2 .

It is not a de Polignac number, because 64932722761 - 2⁷ = 64932722633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64932722731) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 669409465 + ... + 669409561.

Almost surely, 2^64932722761 is an apocalyptic number.

64932722761 is the 254819-th square number.

64932722761 is the 127410-th centered octagonal number.

It is an amenable number.

64932722761 is a deficient number, since it is larger than the sum of its proper divisors (3460549676).

64932722761 is an frugal number, since it uses more digits than its factorization.

64932722761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410 (or 205 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 49.

Multiplying 64932722761 by its sum of digits (49), we get a square (3181703415289 = 1783733²).

The spelling of 64932722761 in words is "sixty-four billion, nine hundred thirty-two million, seven hundred twenty-two thousand, seven hundred sixty-one".