18656231040 has 320 divisors, whose sum is σ = 69525941760. Its totient is φ = 4758386688.

The previous prime is 18656230973. The next prime is 18656231093. The reversal of 18656231040 is 4013265681.

It is a happy number.

18656231040 is a `hidden beast` number, since 1 + 86 + 562 + 3 + 10 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18656230986 and 18656231004.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1184497 + ... + 1200143.

It is an arithmetic number, because the mean of its divisors is an integer number (217268568).

Almost surely, 2^18656231040 is an apocalyptic number.

18656231040 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 18656231040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34762970880).

18656231040 is an abundant number, since it is smaller than the sum of its proper divisors (50869710720).

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

18656231040 is a wasteful number, since it uses less digits than its factorization.

18656231040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15701 (or 15680 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 18656231040 in words is "eighteen billion, six hundred fifty-six million, two hundred thirty-one thousand, forty".