22394474978 has 6 divisors (see below), whose sum is σ = 33592029921. Its totient is φ = 11197131672.

The previous prime is 22394474953. The next prime is 22394474983. The reversal of 22394474978 is 87947449322.

It can be written as a sum of positive squares in 2 ways, for example, as 15111047329 + 7283427649 = 122927^2 + 85343^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=105817.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 158726 + ... + 264542.

Almost surely, 2^22394474978 is an apocalyptic number.

22394474978 is a deficient number, since it is larger than the sum of its proper divisors (11197554943).

22394474978 is an frugal number, since it uses more digits than its factorization.

22394474978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211636 (or 105819 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 59.

The spelling of 22394474978 in words is "twenty-two billion, three hundred ninety-four million, four hundred seventy-four thousand, nine hundred seventy-eight".