66877001947 has 16 divisors (see below), whose sum is σ = 80939008512. Its totient is φ = 53943050880.

The previous prime is 66877001909. The next prime is 66877001969. The reversal of 66877001947 is 74910077866.

66877001947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-66877001947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66877001987) 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, 823122 + ... + 900712.

It is an arithmetic number, because the mean of its divisors is an integer number (5058688032).

Almost surely, 2^66877001947 is an apocalyptic number.

66877001947 is a deficient number, since it is larger than the sum of its proper divisors (14062006565).

66877001947 is a wasteful number, since it uses less digits than its factorization.

66877001947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84858.

The product of its (nonzero) digits is 3556224, while the sum is 55.

The spelling of 66877001947 in words is "sixty-six billion, eight hundred seventy-seven million, one thousand, nine hundred forty-seven".