1655566651 has 2 divisors, whose sum is σ = 1655566652. Its totient is φ = 1655566650.

The previous prime is 1655566613. The next prime is 1655566663. The reversal of 1655566651 is 1566655561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1655566651 - 2⁹ = 1655566139 is a prime.

It is not a weakly prime, because it can be changed into another prime (1655566351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827783325 + 827783326.

It is an arithmetic number, because the mean of its divisors is an integer number (827783326).

Almost surely, 2^1655566651 is an apocalyptic number.

1655566651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655566651 is an equidigital number, since it uses as much as digits as its factorization.

1655566651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810000, while the sum is 46.

The square root of 1655566651 is about 40688.6550650178. The cubic root of 1655566651 is about 1182.9931317389.

The spelling of 1655566651 in words is "one billion, six hundred fifty-five million, five hundred sixty-six thousand, six hundred fifty-one".