64081718858 has 16 divisors (see below), whose sum is σ = 101840504904. Its totient is φ = 30137241600.

The previous prime is 64081718849. The next prime is 64081718863. The reversal of 64081718858 is 85881718046.

It can be written as a sum of positive squares in 4 ways, for example, as 53892229609 + 10189489249 = 232147^2 + 100943^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534185 + ... + 643052.

Almost surely, 2^64081718858 is an apocalyptic number.

64081718858 is a deficient number, since it is larger than the sum of its proper divisors (37758786046).

64081718858 is a wasteful number, since it uses less digits than its factorization.

64081718858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178857.

The product of its (nonzero) digits is 3440640, while the sum is 56.

The spelling of 64081718858 in words is "sixty-four billion, eighty-one million, seven hundred eighteen thousand, eight hundred fifty-eight".