22151865840 has 80 divisors (see below), whose sum is σ = 73953162528. Its totient is φ = 5452766208.

The previous prime is 22151865811. The next prime is 22151865871. The reversal of 22151865840 is 4856815122.

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

It is a junction number, because it is equal to n+sod(n) for n = 22151865792 and 22151865801.

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, 3546859 + ... + 3553098.

Almost surely, 2^22151865840 is an apocalyptic number.

22151865840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22151865840 is an abundant number, since it is smaller than the sum of its proper divisors (51801296688).

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

22151865840 is a wasteful number, since it uses less digits than its factorization.

22151865840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7099986 (or 7099980 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 42.

The spelling of 22151865840 in words is "twenty-two billion, one hundred fifty-one million, eight hundred sixty-five thousand, eight hundred forty".