64564273332 has 36 divisors (see below), whose sum is σ = 175758300900. Its totient is φ = 19865930112.

The previous prime is 64564273307. The next prime is 64564273343. The reversal of 64564273332 is 23337246546.

64564273332 is a `hidden beast` number, since 6 + 4 + 564 + 27 + 33 + 32 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 23742495396 + 40821777936 = 154086^2 + 202044^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68978457 + ... + 68979392.

It is an arithmetic number, because the mean of its divisors is an integer number (4882175025).

Almost surely, 2^64564273332 is an apocalyptic number.

It is an amenable number.

64564273332 is an abundant number, since it is smaller than the sum of its proper divisors (111194027568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64564273332 is a wasteful number, since it uses less digits than its factorization.

64564273332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137957872 (or 137957867 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 45.

The spelling of 64564273332 in words is "sixty-four billion, five hundred sixty-four million, two hundred seventy-three thousand, three hundred thirty-two".