669742784211 has 16 divisors (see below), whose sum is σ = 893844321440. Its totient is φ = 446068373760.

The previous prime is 669742784177. The next prime is 669742784309. The reversal of 669742784211 is 112487247966.

It is not a de Polignac number, because 669742784211 - 2²⁵ = 669709229779 is a prime.

It is a super-2 number, since 2×669742784211² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669742784611) 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, 20570301 + ... + 20602833.

It is an arithmetic number, because the mean of its divisors is an integer number (55865270090).

Almost surely, 2^669742784211 is an apocalyptic number.

669742784211 is a deficient number, since it is larger than the sum of its proper divisors (224101537229).

669742784211 is a wasteful number, since it uses less digits than its factorization.

669742784211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38886.

The product of its digits is 8128512, while the sum is 57.

The spelling of 669742784211 in words is "six hundred sixty-nine billion, seven hundred forty-two million, seven hundred eighty-four thousand, two hundred eleven".