64145541731 has 8 divisors (see below), whose sum is σ = 66938409504. Its totient is φ = 61353001600.

The previous prime is 64145541727. The next prime is 64145541749. The reversal of 64145541731 is 13714554146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64145541731 - 2² = 64145541727 is a prime.

It is a super-2 number, since 2×64145541731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64145541701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371675 + ... + 516171.

It is an arithmetic number, because the mean of its divisors is an integer number (8367301188).

Almost surely, 2^64145541731 is an apocalyptic number.

64145541731 is a deficient number, since it is larger than the sum of its proper divisors (2792867773).

64145541731 is a wasteful number, since it uses less digits than its factorization.

64145541731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163821.

The product of its digits is 201600, while the sum is 41.

The spelling of 64145541731 in words is "sixty-four billion, one hundred forty-five million, five hundred forty-one thousand, seven hundred thirty-one".