22691557778 has 16 divisors (see below), whose sum is σ = 34845851040. Its totient is φ = 11076530976.

The previous prime is 22691557771. The next prime is 22691557807. The reversal of 22691557778 is 87775519622.

It is not an unprimeable number, because it can be changed into a prime (22691557771) 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, 116501 + ... + 242807.

It is an arithmetic number, because the mean of its divisors is an integer number (2177865690).

Almost surely, 2^22691557778 is an apocalyptic number.

22691557778 is a deficient number, since it is larger than the sum of its proper divisors (12154293262).

22691557778 is a wasteful number, since it uses less digits than its factorization.

22691557778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128441.

The product of its digits is 14817600, while the sum is 59.

The spelling of 22691557778 in words is "twenty-two billion, six hundred ninety-one million, five hundred fifty-seven thousand, seven hundred seventy-eight".