18061797600 has 432 divisors, whose sum is σ = 79408667520. Its totient is φ = 3752985600.

The previous prime is 18061797569. The next prime is 18061797697. The reversal of 18061797600 is 679716081.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 538111 + ... + 570689.

It is an arithmetic number, because the mean of its divisors is an integer number (183816360).

Almost surely, 2^18061797600 is an apocalyptic number.

18061797600 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 18061797600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39704333760).

18061797600 is an abundant number, since it is smaller than the sum of its proper divisors (61346869920).

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

18061797600 is a wasteful number, since it uses less digits than its factorization.

18061797600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32623 (or 32607 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The spelling of 18061797600 in words is "eighteen billion, sixty-one million, seven hundred ninety-seven thousand, six hundred".