64971506933 has 4 divisors (see below), whose sum is σ = 68793360300. Its totient is φ = 61149653568.

The previous prime is 64971506903. The next prime is 64971507017. The reversal of 64971506933 is 33960517946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55008073444 + 9963433489 = 234538^2 + 99817^2 .

It is a cyclic number.

It is not a de Polignac number, because 64971506933 - 2⁶ = 64971506869 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 (64971506903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1910926658 + ... + 1910926691.

It is an arithmetic number, because the mean of its divisors is an integer number (17198340075).

Almost surely, 2^64971506933 is an apocalyptic number.

It is an amenable number.

64971506933 is a deficient number, since it is larger than the sum of its proper divisors (3821853367).

64971506933 is a wasteful number, since it uses less digits than its factorization.

64971506933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3821853366.

The product of its (nonzero) digits is 3674160, while the sum is 53.

The spelling of 64971506933 in words is "sixty-four billion, nine hundred seventy-one million, five hundred six thousand, nine hundred thirty-three".