64306560491 has 4 divisors (see below), whose sum is σ = 64307282592. Its totient is φ = 64305838392.

The previous prime is 64306560469. The next prime is 64306560497. The reversal of 64306560491 is 19406560346.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 64306560491 - 2¹⁸ = 64306298347 is a prime.

It is a super-2 number, since 2×64306560491² (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 (64306560497) 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, 204980 + ... + 413073.

It is an arithmetic number, because the mean of its divisors is an integer number (16076820648).

Almost surely, 2^64306560491 is an apocalyptic number.

64306560491 is a deficient number, since it is larger than the sum of its proper divisors (722101).

64306560491 is a wasteful number, since it uses less digits than its factorization.

64306560491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722100.

The product of its (nonzero) digits is 466560, while the sum is 44.

The spelling of 64306560491 in words is "sixty-four billion, three hundred six million, five hundred sixty thousand, four hundred ninety-one".