22543655512621 has 2 divisors, whose sum is σ = 22543655512622. Its totient is φ = 22543655512620.

The previous prime is 22543655512597. The next prime is 22543655512709. The reversal of 22543655512621 is 12621555634522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16373846624521 + 6169808888100 = 4046461^2 + 2483910^2 .

It is a cyclic number.

It is not a de Polignac number, because 22543655512621 - 2⁵ = 22543655512589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22543655518621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11271827756310 + 11271827756311.

It is an arithmetic number, because the mean of its divisors is an integer number (11271827756311).

Almost surely, 2^{22543655512621} is an apocalyptic number.

It is an amenable number.

22543655512621 is a deficient number, since it is larger than the sum of its proper divisors (1).

22543655512621 is an equidigital number, since it uses as much as digits as its factorization.

22543655512621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320000, while the sum is 49.

The spelling of 22543655512621 in words is "twenty-two trillion, five hundred forty-three billion, six hundred fifty-five million, five hundred twelve thousand, six hundred twenty-one".