18158722560 has 800 divisors, whose sum is σ = 74863958400. Its totient is φ = 4160471040.

The previous prime is 18158722537. The next prime is 18158722607. The reversal of 18158722560 is 6522785181.

18158722560 is a `hidden beast` number, since 1 + 8 + 1 + 5 + 87 + 2 + 2 + 560 = 666.

It is a super-2 number, since 2×18158722560² (a number of 21 digits) contains 22 as substring.

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 79 ways as a sum of consecutive naturals, for example, 43338031 + ... + 43338449.

It is an arithmetic number, because the mean of its divisors is an integer number (93579948).

Almost surely, 2^18158722560 is an apocalyptic number.

18158722560 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 18158722560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37431979200).

18158722560 is an abundant number, since it is smaller than the sum of its proper divisors (56705235840).

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

18158722560 is a wasteful number, since it uses less digits than its factorization.

18158722560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 459 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The spelling of 18158722560 in words is "eighteen billion, one hundred fifty-eight million, seven hundred twenty-two thousand, five hundred sixty".