18700555550 has 24 divisors (see below), whose sum is σ = 34863404016. Its totient is φ = 7462938240.

The previous prime is 18700555541. The next prime is 18700555553. The reversal of 18700555550 is 5555500781.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18700555498 and 18700555507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18700555553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 410234 + ... + 453533.

It is an arithmetic number, because the mean of its divisors is an integer number (1452641834).

Almost surely, 2^18700555550 is an apocalyptic number.

18700555550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18700555550 is a deficient number, since it is larger than the sum of its proper divisors (16162848466).

18700555550 is a wasteful number, since it uses less digits than its factorization.

18700555550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864212 (or 864207 counting only the distinct ones).

The product of its (nonzero) digits is 175000, while the sum is 41.

The spelling of 18700555550 in words is "eighteen billion, seven hundred million, five hundred fifty-five thousand, five hundred fifty".