64765409531 has 4 divisors (see below), whose sum is σ = 64766629200. Its totient is φ = 64764189864.

The previous prime is 64765409491. The next prime is 64765409551. The reversal of 64765409531 is 13590456746.

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 64765409531 - 2¹⁰ = 64765408507 is a prime.

It is a super-2 number, since 2×64765409531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64765409531.

It is not an unprimeable number, because it can be changed into a prime (64765409551) 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, 526376 + ... + 637653.

It is an arithmetic number, because the mean of its divisors is an integer number (16191657300).

Almost surely, 2^64765409531 is an apocalyptic number.

64765409531 is a deficient number, since it is larger than the sum of its proper divisors (1219669).

64765409531 is a wasteful number, since it uses less digits than its factorization.

64765409531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219668.

The product of its (nonzero) digits is 2721600, while the sum is 50.

The spelling of 64765409531 in words is "sixty-four billion, seven hundred sixty-five million, four hundred nine thousand, five hundred thirty-one".