55049999978 has 8 divisors (see below), whose sum is σ = 82587017568. Its totient is φ = 27520994124.

The previous prime is 55049999971. The next prime is 55050000001. The reversal of 55049999978 is 87999994055.

55049999978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (55049999971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1985726 + ... + 2013257.

It is an arithmetic number, because the mean of its divisors is an integer number (10323377196).

Almost surely, 2^55049999978 is an apocalyptic number.

55049999978 is a deficient number, since it is larger than the sum of its proper divisors (27537017590).

55049999978 is a wasteful number, since it uses less digits than its factorization.

55049999978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4005868.

The product of its (nonzero) digits is 330674400, while the sum is 74.

The spelling of 55049999978 in words is "fifty-five billion, forty-nine million, nine hundred ninety-nine thousand, nine hundred seventy-eight".