22615645520 has 80 divisors (see below), whose sum is σ = 56657540352. Its totient is φ = 8345756160.

The previous prime is 22615645519. The next prime is 22615645541. The reversal of 22615645520 is 2554651622.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×22615645520² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2286185 + ... + 2296055.

Almost surely, 2^22615645520 is an apocalyptic number.

22615645520 is a gapful number since it is divisible by the number (20) 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 22615645520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28328770176).

22615645520 is an abundant number, since it is smaller than the sum of its proper divisors (34041894832).

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

22615645520 is a wasteful number, since it uses less digits than its factorization.

22615645520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12100 (or 12094 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 22615645520 in words is "twenty-two billion, six hundred fifteen million, six hundred forty-five thousand, five hundred twenty".