22478146778 has 4 divisors (see below), whose sum is σ = 33717220170. Its totient is φ = 11239073388.

The previous prime is 22478146763. The next prime is 22478146811. The reversal of 22478146778 is 87764187422.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87764187422 = 2 ⋅43882093711.

It can be written as a sum of positive squares in only one way, i.e., 22152452569 + 325694209 = 148837^2 + 18047^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5619536693 + ... + 5619536696.

Almost surely, 2^22478146778 is an apocalyptic number.

22478146778 is a deficient number, since it is larger than the sum of its proper divisors (11239073392).

22478146778 is a wasteful number, since it uses less digits than its factorization.

22478146778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11239073391.

The product of its digits is 8429568, while the sum is 56.

The spelling of 22478146778 in words is "twenty-two billion, four hundred seventy-eight million, one hundred forty-six thousand, seven hundred seventy-eight".