64031899993 has 2 divisors, whose sum is σ = 64031899994. Its totient is φ = 64031899992.

The previous prime is 64031899963. The next prime is 64031900011. The reversal of 64031899993 is 39999813046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62922210649 + 1109689344 = 250843^2 + 33312^2 .

It is a cyclic number.

It is not a de Polignac number, because 64031899993 - 2²⁵ = 63998345561 is a prime.

It is not a weakly prime, because it can be changed into another prime (64031899963) 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 as a sum of consecutive naturals, namely, 32015949996 + 32015949997.

It is an arithmetic number, because the mean of its divisors is an integer number (32015949997).

Almost surely, 2^64031899993 is an apocalyptic number.

It is an amenable number.

64031899993 is a deficient number, since it is larger than the sum of its proper divisors (1).

64031899993 is an equidigital number, since it uses as much as digits as its factorization.

64031899993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11337408, while the sum is 61.

The spelling of 64031899993 in words is "sixty-four billion, thirty-one million, eight hundred ninety-nine thousand, nine hundred ninety-three".