22561521101561 has 16 divisors (see below), whose sum is σ = 24815406271488. Its totient is φ = 20381741640000.

The previous prime is 22561521101543. The next prime is 22561521101593. The reversal of 22561521101561 is 16510112516522.

It is not a de Polignac number, because 22561521101561 - 2¹⁴ = 22561521085177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22561521101521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9671711 + ... + 11775611.

It is an arithmetic number, because the mean of its divisors is an integer number (1550962891968).

Almost surely, 2^{22561521101561} is an apocalyptic number.

It is an amenable number.

22561521101561 is a deficient number, since it is larger than the sum of its proper divisors (2253885169927).

22561521101561 is a wasteful number, since it uses less digits than its factorization.

22561521101561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121512.

The product of its (nonzero) digits is 36000, while the sum is 38.

The spelling of 22561521101561 in words is "twenty-two trillion, five hundred sixty-one billion, five hundred twenty-one million, one hundred one thousand, five hundred sixty-one".