13664934640578 has 32 divisors (see below), whose sum is σ = 29512363620096. Its totient is φ = 4193138602368.

The previous prime is 13664934640573. The next prime is 13664934640607. The reversal of 13664934640578 is 87504643946631.

It is not an unprimeable number, because it can be changed into a prime (13664934640573) 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, 238651851 + ... + 238709102.

It is an arithmetic number, because the mean of its divisors is an integer number (922261363128).

Almost surely, 2^{13664934640578} is an apocalyptic number.

13664934640578 is an abundant number, since it is smaller than the sum of its proper divisors (15847428979518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13664934640578 is a wasteful number, since it uses less digits than its factorization.

13664934640578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477361338.

The product of its (nonzero) digits is 313528320, while the sum is 66.

The spelling of 13664934640578 in words is "thirteen trillion, six hundred sixty-four billion, nine hundred thirty-four million, six hundred forty thousand, five hundred seventy-eight".