18197908740 has 720 divisors, whose sum is σ = 68520646656. Its totient is φ = 4023613440.

The previous prime is 18197908739. The next prime is 18197908789. The reversal of 18197908740 is 4780979181.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 143290557 + ... + 143290683.

Almost surely, 2^18197908740 is an apocalyptic number.

18197908740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18197908740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34260323328).

18197908740 is an abundant number, since it is smaller than the sum of its proper divisors (50322737916).

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

18197908740 is a wasteful number, since it uses less digits than its factorization.

18197908740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 54.

The spelling of 18197908740 in words is "eighteen billion, one hundred ninety-seven million, nine hundred eight thousand, seven hundred forty".