64365643531 has 16 divisors (see below), whose sum is σ = 77640006400. Its totient is φ = 52126672608.

The previous prime is 64365643513. The next prime is 64365643541. The reversal of 64365643531 is 13534656346.

It is a cyclic number.

It is not a de Polignac number, because 64365643531 - 2⁹ = 64365643019 is a prime.

It is a super-2 number, since 2×64365643531² (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 (64365643541) 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 15 ways as a sum of consecutive naturals, for example, 599121 + ... + 698338.

It is an arithmetic number, because the mean of its divisors is an integer number (4852500400).

Almost surely, 2^64365643531 is an apocalyptic number.

64365643531 is a deficient number, since it is larger than the sum of its proper divisors (13274362869).

64365643531 is a wasteful number, since it uses less digits than its factorization.

64365643531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297858.

The product of its digits is 2332800, while the sum is 46.

The spelling of 64365643531 in words is "sixty-four billion, three hundred sixty-five million, six hundred forty-three thousand, five hundred thirty-one".