18195596640 has 576 divisors, whose sum is σ = 69392598912. Its totient is φ = 4313088000.

The previous prime is 18195596581. The next prime is 18195596651. The reversal of 18195596640 is 4669559181.

18195596640 is a `hidden beast` number, since 1 + 8 + 1 + 9 + 5 + 596 + 6 + 40 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 115895442 + ... + 115895598.

It is an arithmetic number, because the mean of its divisors is an integer number (120473262).

Almost surely, 2^18195596640 is an apocalyptic number.

18195596640 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 18195596640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34696299456).

18195596640 is an abundant number, since it is smaller than the sum of its proper divisors (51197002272).

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

18195596640 is a wasteful number, since it uses less digits than its factorization.

18195596640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383 (or 372 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The spelling of 18195596640 in words is "eighteen billion, one hundred ninety-five million, five hundred ninety-six thousand, six hundred forty".