18909471700 has 36 divisors (see below), whose sum is σ = 46895491552. Its totient is φ = 6483247200.

The previous prime is 18909471661. The next prime is 18909471709. The reversal of 18909471700 is 717490981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18909471709) 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, 13506066 + ... + 13507465.

Almost surely, 2^18909471700 is an apocalyptic number.

18909471700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18909471700 is an abundant number, since it is smaller than the sum of its proper divisors (27986019852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18909471700 is a wasteful number, since it uses less digits than its factorization.

18909471700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27013552 (or 27013545 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 46.

The spelling of 18909471700 in words is "eighteen billion, nine hundred nine million, four hundred seventy-one thousand, seven hundred".