2172305090561 has 2 divisors, whose sum is σ = 2172305090562. Its totient is φ = 2172305090560.

The previous prime is 2172305090551. The next prime is 2172305090621. The reversal of 2172305090561 is 1650905032712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1750246974961 + 422058115600 = 1322969^2 + 649660^2 .

It is a cyclic number.

It is not a de Polignac number, because 2172305090561 - 2⁶ = 2172305090497 is a prime.

It is a super-2 number, since 2×2172305090561² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2172305090531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086152545280 + 1086152545281.

It is an arithmetic number, because the mean of its divisors is an integer number (1086152545281).

Almost surely, 2^{2172305090561} is an apocalyptic number.

It is an amenable number.

2172305090561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172305090561 is an equidigital number, since it uses as much as digits as its factorization.

2172305090561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 41.

The spelling of 2172305090561 in words is "two trillion, one hundred seventy-two billion, three hundred five million, ninety thousand, five hundred sixty-one".