18721775955 has 8 divisors (see below), whose sum is σ = 29954841552. Its totient is φ = 9984947168.

The previous prime is 18721775939. The next prime is 18721775971. The reversal of 18721775955 is 55957712781.

It is an interprime number because it is at equal distance from previous prime (18721775939) and next prime (18721775971).

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

It is a cyclic number.

It is not a de Polignac number, because 18721775955 - 2⁴ = 18721775939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18721775895 and 18721775904.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 624059184 + ... + 624059213.

It is an arithmetic number, because the mean of its divisors is an integer number (3744355194).

Almost surely, 2^18721775955 is an apocalyptic number.

18721775955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18721775955 is a deficient number, since it is larger than the sum of its proper divisors (11233065597).

18721775955 is a wasteful number, since it uses less digits than its factorization.

18721775955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248118405.

The product of its digits is 6174000, while the sum is 57.

The spelling of 18721775955 in words is "eighteen billion, seven hundred twenty-one million, seven hundred seventy-five thousand, nine hundred fifty-five".