64398187943 has 2 divisors, whose sum is σ = 64398187944. Its totient is φ = 64398187942.

The previous prime is 64398187933. The next prime is 64398187963. The reversal of 64398187943 is 34978189346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64398187943 - 2⁸ = 64398187687 is a prime.

It is a super-2 number, since 2×64398187943² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64398187913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32199093971 + 32199093972.

It is an arithmetic number, because the mean of its divisors is an integer number (32199093972).

Almost surely, 2^64398187943 is an apocalyptic number.

64398187943 is a deficient number, since it is larger than the sum of its proper divisors (1).

64398187943 is an equidigital number, since it uses as much as digits as its factorization.

64398187943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31352832, while the sum is 62.

The spelling of 64398187943 in words is "sixty-four billion, three hundred ninety-eight million, one hundred eighty-seven thousand, nine hundred forty-three".