66577380578 has 16 divisors (see below), whose sum is σ = 108513219840. Its totient is φ = 30519342000.

The previous prime is 66577380577. The next prime is 66577380581. The reversal of 66577380578 is 87508377566.

It is a super-2 number, since 2×66577380578² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a self number, because there is not a number n which added to its sum of digits gives 66577380578.

It is not an unprimeable number, because it can be changed into a prime (66577380577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28257473 + ... + 28259828.

It is an arithmetic number, because the mean of its divisors is an integer number (6782076240).

Almost surely, 2^66577380578 is an apocalyptic number.

66577380578 is a deficient number, since it is larger than the sum of its proper divisors (41935839262).

66577380578 is a wasteful number, since it uses less digits than its factorization.

66577380578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56517353.

The product of its (nonzero) digits is 59270400, while the sum is 62.

The spelling of 66577380578 in words is "sixty-six billion, five hundred seventy-seven million, three hundred eighty thousand, five hundred seventy-eight".