64494591663 has 16 divisors (see below), whose sum is σ = 89822983680. Its totient is φ = 41085104544.

The previous prime is 64494591631. The next prime is 64494591739. The reversal of 64494591663 is 36619549446.

It is not a de Polignac number, because 64494591663 - 2⁵ = 64494591631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64494591163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407608 + ... + 543261.

It is an arithmetic number, because the mean of its divisors is an integer number (5613936480).

Almost surely, 2^64494591663 is an apocalyptic number.

64494591663 is a deficient number, since it is larger than the sum of its proper divisors (25328392017).

64494591663 is a wasteful number, since it uses less digits than its factorization.

64494591663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951878.

The product of its digits is 16796160, while the sum is 57.

The spelling of 64494591663 in words is "sixty-four billion, four hundred ninety-four million, five hundred ninety-one thousand, six hundred sixty-three".