64943056531 has 4 divisors (see below), whose sum is σ = 66007696864. Its totient is φ = 63878416200.

The previous prime is 64943056523. The next prime is 64943056543. The reversal of 64943056531 is 13565034946.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64943056531 - 2³ = 64943056523 is a prime.

It is a super-2 number, since 2×64943056531² (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 (64943056511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532320075 + ... + 532320196.

It is an arithmetic number, because the mean of its divisors is an integer number (16501924216).

Almost surely, 2^64943056531 is an apocalyptic number.

64943056531 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

64943056531 is a deficient number, since it is larger than the sum of its proper divisors (1064640333).

64943056531 is a wasteful number, since it uses less digits than its factorization.

64943056531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064640332.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 64943056531 in words is "sixty-four billion, nine hundred forty-three million, fifty-six thousand, five hundred thirty-one".