22571489978 has 4 divisors (see below), whose sum is σ = 33857234970. Its totient is φ = 11285744988.

The previous prime is 22571489959. The next prime is 22571490031. The reversal of 22571489978 is 87998417522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87998417522 = 2 ⋅43999208761.

It can be written as a sum of positive squares in only one way, i.e., 21175197289 + 1396292689 = 145517^2 + 37367^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 22571489978.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5642872493 + ... + 5642872496.

Almost surely, 2^22571489978 is an apocalyptic number.

22571489978 is a deficient number, since it is larger than the sum of its proper divisors (11285744992).

22571489978 is a wasteful number, since it uses less digits than its factorization.

22571489978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11285744991.

The product of its digits is 20321280, while the sum is 62.

The spelling of 22571489978 in words is "twenty-two billion, five hundred seventy-one million, four hundred eighty-nine thousand, nine hundred seventy-eight".