22661777639 has 4 divisors (see below), whose sum is σ = 22834768440. Its totient is φ = 22488786840.

The previous prime is 22661777599. The next prime is 22661777651. The reversal of 22661777639 is 93677716622.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22661777639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22661777669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86495204 + ... + 86495465.

It is an arithmetic number, because the mean of its divisors is an integer number (5708692110).

Almost surely, 2^22661777639 is an apocalyptic number.

22661777639 is a deficient number, since it is larger than the sum of its proper divisors (172990801).

22661777639 is a wasteful number, since it uses less digits than its factorization.

22661777639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172990800.

The product of its digits is 8001504, while the sum is 56.

The spelling of 22661777639 in words is "twenty-two billion, six hundred sixty-one million, seven hundred seventy-seven thousand, six hundred thirty-nine".