16626635721061 has 2 divisors, whose sum is σ = 16626635721062. Its totient is φ = 16626635721060.

The previous prime is 16626635721053. The next prime is 16626635721263. The reversal of 16626635721061 is 16012753662661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16222608952900 + 404026768161 = 4027730^2 + 635631^2 .

It is a cyclic number.

It is not a de Polignac number, because 16626635721061 - 2³ = 16626635721053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16626635721461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8313317860530 + 8313317860531.

It is an arithmetic number, because the mean of its divisors is an integer number (8313317860531).

Almost surely, 2^{16626635721061} is an apocalyptic number.

It is an amenable number.

16626635721061 is a deficient number, since it is larger than the sum of its proper divisors (1).

16626635721061 is an equidigital number, since it uses as much as digits as its factorization.

16626635721061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 52.

The spelling of 16626635721061 in words is "sixteen trillion, six hundred twenty-six billion, six hundred thirty-five million, seven hundred twenty-one thousand, sixty-one".