66678813077586 has 32 divisors (see below), whose sum is σ = 137559973266240. Its totient is φ = 21531126217536.

The previous prime is 66678813077561. The next prime is 66678813077599. The reversal of 66678813077586 is 68577031887666.

It is a super-2 number, since 2×66678813077586² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 655746136 + ... + 655847811.

It is an arithmetic number, because the mean of its divisors is an integer number (4298749164570).

Almost surely, 2^{66678813077586} is an apocalyptic number.

66678813077586 is an abundant number, since it is smaller than the sum of its proper divisors (70881160188654).

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

66678813077586 is a wasteful number, since it uses less digits than its factorization.

66678813077586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311594218.

The product of its (nonzero) digits is 3413975040, while the sum is 78.

The spelling of 66678813077586 in words is "sixty-six trillion, six hundred seventy-eight billion, eight hundred thirteen million, seventy-seven thousand, five hundred eighty-six".