64861163731 has 48 divisors (see below), whose sum is σ = 85862246400. Its totient is φ = 48465248832.

The previous prime is 64861163729. The next prime is 64861163749. The reversal of 64861163731 is 13736116846.

It is not a de Polignac number, because 64861163731 - 2¹ = 64861163729 is a prime.

It is a super-2 number, since 2×64861163731² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64861163711) 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 47 ways as a sum of consecutive naturals, for example, 1129410 + ... + 1185448.

It is an arithmetic number, because the mean of its divisors is an integer number (1788796800).

Almost surely, 2^64861163731 is an apocalyptic number.

64861163731 is a deficient number, since it is larger than the sum of its proper divisors (21001082669).

64861163731 is a wasteful number, since it uses less digits than its factorization.

64861163731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56168 (or 56161 counting only the distinct ones).

The product of its digits is 435456, while the sum is 46.

The spelling of 64861163731 in words is "sixty-four billion, eight hundred sixty-one million, one hundred sixty-three thousand, seven hundred thirty-one".