64650278563 has 12 divisors (see below), whose sum is σ = 70475788800. Its totient is φ = 59276639136.

The previous prime is 64650278557. The next prime is 64650278569. The reversal of 64650278563 is 36587205646.

It is an interprime number because it is at equal distance from previous prime (64650278557) and next prime (64650278569).

It is not a de Polignac number, because 64650278563 - 2⁵ = 64650278531 is a prime.

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 64650278563.

It is not an unprimeable number, because it can be changed into a prime (64650278569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1258531 + ... + 1308892.

It is an arithmetic number, because the mean of its divisors is an integer number (5872982400).

Almost surely, 2^64650278563 is an apocalyptic number.

64650278563 is a deficient number, since it is larger than the sum of its proper divisors (5825510237).

64650278563 is a wasteful number, since it uses less digits than its factorization.

64650278563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2567598 (or 2567585 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 52.

The spelling of 64650278563 in words is "sixty-four billion, six hundred fifty million, two hundred seventy-eight thousand, five hundred sixty-three".