18188396650 has 24 divisors (see below), whose sum is σ = 33845423040. Its totient is φ = 7272131760.

The previous prime is 18188396617. The next prime is 18188396717. The reversal of 18188396650 is 5669388181.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18188396591 and 18188396600.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34821 + ... + 193879.

It is an arithmetic number, because the mean of its divisors is an integer number (1410225960).

Almost surely, 2^18188396650 is an apocalyptic number.

18188396650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18188396650 is a deficient number, since it is larger than the sum of its proper divisors (15657026390).

18188396650 is a wasteful number, since it uses less digits than its factorization.

18188396650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161358 (or 161353 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 55.

The spelling of 18188396650 in words is "eighteen billion, one hundred eighty-eight million, three hundred ninety-six thousand, six hundred fifty".