22518039640 has 16 divisors (see below), whose sum is σ = 50665589280. Its totient is φ = 9007215840.

The previous prime is 22518039613. The next prime is 22518039641. The reversal of 22518039640 is 4693081522.

It is a super-2 number, since 2×22518039640² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 562950991 = 22518039640 / (2 + 2 + 5 + 1 + 8 + 0 + 3 + 9 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 22518039593 and 22518039602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22518039641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281475456 + ... + 281475535.

It is an arithmetic number, because the mean of its divisors is an integer number (3166599330).

Almost surely, 2^22518039640 is an apocalyptic number.

22518039640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22518039640 is an abundant number, since it is smaller than the sum of its proper divisors (28147549640).

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

22518039640 is a wasteful number, since it uses less digits than its factorization.

22518039640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562951002 (or 562950998 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 22518039640 in words is "twenty-two billion, five hundred eighteen million, thirty-nine thousand, six hundred forty".