18649293320 has 256 divisors, whose sum is σ = 52646630400. Its totient is φ = 5804789760.

The previous prime is 18649293217. The next prime is 18649293331. The reversal of 18649293320 is 2339294681.

It is a super-2 number, since 2×18649293320² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11391542 + ... + 11393178.

It is an arithmetic number, because the mean of its divisors is an integer number (205650900).

Almost surely, 2^18649293320 is an apocalyptic number.

18649293320 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 18649293320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26323315200).

18649293320 is an abundant number, since it is smaller than the sum of its proper divisors (33997337080).

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

18649293320 is a wasteful number, since it uses less digits than its factorization.

18649293320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768 (or 1764 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 47.

The spelling of 18649293320 in words is "eighteen billion, six hundred forty-nine million, two hundred ninety-three thousand, three hundred twenty".