18347840680 has 32 divisors (see below), whose sum is σ = 44458230600. Its totient is φ = 6774587136.

The previous prime is 18347840671. The next prime is 18347840711. The reversal of 18347840680 is 8604874381.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6084936036 + 12262904644 = 78006^2 + 110738^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17641635 + ... + 17642674.

Almost surely, 2^18347840680 is an apocalyptic number.

18347840680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18347840680 is an abundant number, since it is smaller than the sum of its proper divisors (26110389920).

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

18347840680 is a wasteful number, since it uses less digits than its factorization.

18347840680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35284333 (or 35284329 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 49.

The spelling of 18347840680 in words is "eighteen billion, three hundred forty-seven million, eight hundred forty thousand, six hundred eighty".