55555004999978 has 8 divisors (see below), whose sum is σ = 90908190000000. Its totient is φ = 25252274999980.

The previous prime is 55555004999953. The next prime is 55555004999993. The reversal of 55555004999978 is 87999940055555.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1262613749978 + ... + 1262613750021.

It is an arithmetic number, because the mean of its divisors is an integer number (11363523750000).

Almost surely, 2^{55555004999978} is an apocalyptic number.

55555004999978 is a deficient number, since it is larger than the sum of its proper divisors (35353185000022).

55555004999978 is a wasteful number, since it uses less digits than its factorization.

55555004999978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2525227500012.

The product of its (nonzero) digits is 4592700000, while the sum is 80.

The spelling of 55555004999978 in words is "fifty-five trillion, five hundred fifty-five billion, four million, nine hundred ninety-nine thousand, nine hundred seventy-eight".