220621261063657 has 2 divisors, whose sum is σ = 220621261063658. Its totient is φ = 220621261063656.

The previous prime is 220621261063649. The next prime is 220621261063667. The reversal of 220621261063657 is 756360162126022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212549690279056 + 8071570784601 = 14579084^2 + 2841051^2 .

It is a cyclic number.

It is not a de Polignac number, because 220621261063657 - 2³ = 220621261063649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220621261063657.

It is not a weakly prime, because it can be changed into another prime (220621261063667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110310630531828 + 110310630531829.

It is an arithmetic number, because the mean of its divisors is an integer number (110310630531829).

Almost surely, 2^{220621261063657} is an apocalyptic number.

It is an amenable number.

220621261063657 is a deficient number, since it is larger than the sum of its proper divisors (1).

220621261063657 is an equidigital number, since it uses as much as digits as its factorization.

220621261063657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 49.

The spelling of 220621261063657 in words is "two hundred twenty trillion, six hundred twenty-one billion, two hundred sixty-one million, sixty-three thousand, six hundred fifty-seven".