22561966891950 has 48 divisors (see below), whose sum is σ = 56234852227200. Its totient is φ = 5986290705120.

The previous prime is 22561966891943. The next prime is 22561966891973. The reversal of 22561966891950 is 5919866916522.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 377892544 + ... + 377952243.

It is an arithmetic number, because the mean of its divisors is an integer number (1171559421400).

Almost surely, 2^{22561966891950} is an apocalyptic number.

22561966891950 is an abundant number, since it is smaller than the sum of its proper divisors (33672885335250).

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

22561966891950 is a wasteful number, since it uses less digits than its factorization.

22561966891950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755845001 (or 755844996 counting only the distinct ones).

The product of its (nonzero) digits is 125971200, while the sum is 69.

The spelling of 22561966891950 in words is "twenty-two trillion, five hundred sixty-one billion, nine hundred sixty-six million, eight hundred ninety-one thousand, nine hundred fifty".