66573078894 has 48 divisors (see below), whose sum is σ = 170165299200. Its totient is φ = 18407301840.

The previous prime is 66573078877. The next prime is 66573078899. The reversal of 66573078894 is 49887037566.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66573078899) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8517994 + ... + 8525805.

It is an arithmetic number, because the mean of its divisors is an integer number (3545110400).

Almost surely, 2^66573078894 is an apocalyptic number.

66573078894 is an abundant number, since it is smaller than the sum of its proper divisors (103592220306).

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

66573078894 is a wasteful number, since it uses less digits than its factorization.

66573078894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17043845 (or 17043842 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 63.

The spelling of 66573078894 in words is "sixty-six billion, five hundred seventy-three million, seventy-eight thousand, eight hundred ninety-four".