220206661651 has 2 divisors, whose sum is σ = 220206661652. Its totient is φ = 220206661650.

The previous prime is 220206661639. The next prime is 220206661657. The reversal of 220206661651 is 156166602022.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220206661651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220206661651.

It is not a weakly prime, because it can be changed into another prime (220206661657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110103330825 + 110103330826.

It is an arithmetic number, because the mean of its divisors is an integer number (110103330826).

Almost surely, 2^220206661651 is an apocalyptic number.

220206661651 is a deficient number, since it is larger than the sum of its proper divisors (1).

220206661651 is an equidigital number, since it uses as much as digits as its factorization.

220206661651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 220206661651 in words is "two hundred twenty billion, two hundred six million, six hundred sixty-one thousand, six hundred fifty-one".