611622205655621 has 2 divisors, whose sum is σ = 611622205655622. Its totient is φ = 611622205655620.

The previous prime is 611622205655569. The next prime is 611622205655677. The reversal of 611622205655621 is 126556502226116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 592791552930721 + 18830652724900 = 24347311^2 + 4339430^2 .

It is a cyclic number.

It is not a de Polignac number, because 611622205655621 - 2³⁰ = 611621131913797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 611622205655621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611622205651621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305811102827810 + 305811102827811.

It is an arithmetic number, because the mean of its divisors is an integer number (305811102827811).

Almost surely, 2^{611622205655621} is an apocalyptic number.

It is an amenable number.

611622205655621 is a deficient number, since it is larger than the sum of its proper divisors (1).

611622205655621 is an equidigital number, since it uses as much as digits as its factorization.

611622205655621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592000, while the sum is 50.

The spelling of 611622205655621 in words is "six hundred eleven trillion, six hundred twenty-two billion, two hundred five million, six hundred fifty-five thousand, six hundred twenty-one".