64775568432947 has 2 divisors, whose sum is σ = 64775568432948. Its totient is φ = 64775568432946.

The previous prime is 64775568432919. The next prime is 64775568432961. The reversal of 64775568432947 is 74923486557746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64775568432947 - 2²⁸ = 64775299997491 is a prime.

It is a super-2 number, since 2×64775568432947² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64775568432907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32387784216473 + 32387784216474.

It is an arithmetic number, because the mean of its divisors is an integer number (32387784216474).

Almost surely, 2^{64775568432947} is an apocalyptic number.

64775568432947 is a deficient number, since it is larger than the sum of its proper divisors (1).

64775568432947 is an equidigital number, since it uses as much as digits as its factorization.

64775568432947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8534937600, while the sum is 77.

The spelling of 64775568432947 in words is "sixty-four trillion, seven hundred seventy-five billion, five hundred sixty-eight million, four hundred thirty-two thousand, nine hundred forty-seven".