55055021555 has 4 divisors (see below), whose sum is σ = 66066025872. Its totient is φ = 44044017240.

The previous prime is 55055021537. The next prime is 55055021573. The reversal of 55055021555 is 55512055055.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (55055021537) and next prime (55055021573).

It is a de Polignac number, because none of the positive numbers 2^k-55055021555 is a prime.

It is a Duffinian 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, 5505502151 + ... + 5505502160.

It is an arithmetic number, because the mean of its divisors is an integer number (16516506468).

Almost surely, 2^55055021555 is an apocalyptic number.

55055021555 is a deficient number, since it is larger than the sum of its proper divisors (11011004317).

55055021555 is a wasteful number, since it uses less digits than its factorization.

55055021555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11011004316.

The product of its (nonzero) digits is 156250, while the sum is 38.

The spelling of 55055021555 in words is "fifty-five billion, fifty-five million, twenty-one thousand, five hundred fifty-five".