55263423978 has 48 divisors (see below), whose sum is σ = 144045021120. Its totient is φ = 14958520128.

The previous prime is 55263423947. The next prime is 55263423979. The reversal of 55263423978 is 87932436255.

55263423978 is a `hidden beast` number, since 5 + 526 + 3 + 4 + 23 + 97 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55263423979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11539675 + ... + 11544462.

It is an arithmetic number, because the mean of its divisors is an integer number (3000937940).

Almost surely, 2^55263423978 is an apocalyptic number.

55263423978 is an abundant number, since it is smaller than the sum of its proper divisors (88781597142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55263423978 is a wasteful number, since it uses less digits than its factorization.

55263423978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23084171 (or 23084168 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 54.

The spelling of 55263423978 in words is "fifty-five billion, two hundred sixty-three million, four hundred twenty-three thousand, nine hundred seventy-eight".