64165501731 has 16 divisors (see below), whose sum is σ = 88181284608. Its totient is φ = 41483114400.

The previous prime is 64165501681. The next prime is 64165501733. The reversal of 64165501731 is 13710556146.

It is not a de Polignac number, because 64165501731 - 2¹⁵ = 64165468963 is a prime.

It is a super-2 number, since 2×64165501731² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64165501731.

It is not an unprimeable number, because it can be changed into a prime (64165501733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2456241 + ... + 2482226.

It is an arithmetic number, because the mean of its divisors is an integer number (5511330288).

Almost surely, 2^64165501731 is an apocalyptic number.

64165501731 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

64165501731 is a deficient number, since it is larger than the sum of its proper divisors (24015782877).

64165501731 is a wasteful number, since it uses less digits than its factorization.

64165501731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4938602.

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 64165501731 in words is "sixty-four billion, one hundred sixty-five million, five hundred one thousand, seven hundred thirty-one".