22801661 has 2 divisors, whose sum is σ = 22801662. Its totient is φ = 22801660.

The previous prime is 22801609. The next prime is 22801663. The reversal of 22801661 is 16610822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17935225 + 4866436 = 4235^2 + 2206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22801661 is a prime.

Together with 22801663, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22801661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22801663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11400830 + 11400831.

It is an arithmetic number, because the mean of its divisors is an integer number (11400831).

Almost surely, 2^22801661 is an apocalyptic number.

It is an amenable number.

22801661 is a deficient number, since it is larger than the sum of its proper divisors (1).

22801661 is an equidigital number, since it uses as much as digits as its factorization.

22801661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 22801661 is about 4775.1084804431. The cubic root of 22801661 is about 283.5668735009.

The spelling of 22801661 in words is "twenty-two million, eight hundred one thousand, six hundred sixty-one".