18689948658 has 24 divisors (see below), whose sum is σ = 40664332800. Its totient is φ = 6203914584.

The previous prime is 18689948657. The next prime is 18689948677. The reversal of 18689948658 is 85684998681.

18689948658 is a `hidden beast` number, since 1 + 8 + 6 + 8 + 99 + 486 + 58 = 666.

It is not an unprimeable number, because it can be changed into a prime (18689948657) 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, 2167938 + ... + 2176541.

It is an arithmetic number, because the mean of its divisors is an integer number (1694347200).

Almost surely, 2^18689948658 is an apocalyptic number.

18689948658 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18689948658 is an abundant number, since it is smaller than the sum of its proper divisors (21974384142).

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

18689948658 is a wasteful number, since it uses less digits than its factorization.

18689948658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4344726 (or 4344723 counting only the distinct ones).

The product of its digits is 238878720, while the sum is 72.

The spelling of 18689948658 in words is "eighteen billion, six hundred eighty-nine million, nine hundred forty-eight thousand, six hundred fifty-eight".