64042539976 has 16 divisors (see below), whose sum is σ = 120701940300. Its totient is φ = 31855355904.

The previous prime is 64042539941. The next prime is 64042540013. The reversal of 64042539976 is 67993524046.

It can be written as a sum of positive squares in 2 ways, for example, as 55276712100 + 8765827876 = 235110^2 + 93626^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20737621 + ... + 20740708.

Almost surely, 2^64042539976 is an apocalyptic number.

It is an amenable number.

64042539976 is a deficient number, since it is larger than the sum of its proper divisors (56659400324).

64042539976 is a wasteful number, since it uses less digits than its factorization.

64042539976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41478528 (or 41478524 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 55.

The spelling of 64042539976 in words is "sixty-four billion, forty-two million, five hundred thirty-nine thousand, nine hundred seventy-six".