1656001651 has 2 divisors, whose sum is σ = 1656001652. Its totient is φ = 1656001650.

The previous prime is 1656001649. The next prime is 1656001667. The reversal of 1656001651 is 1561006561.

It is a weak prime.

It is an emirp because it is prime and its reverse (1561006561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1656001651 - 2¹ = 1656001649 is a prime.

It is a super-2 number, since 2×1656001651² = 5484682936229451602, which contains 22 as substring.

Together with 1656001649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1656001621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828000825 + 828000826.

It is an arithmetic number, because the mean of its divisors is an integer number (828000826).

Almost surely, 2^1656001651 is an apocalyptic number.

1656001651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656001651 is an equidigital number, since it uses as much as digits as its factorization.

1656001651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1656001651 is about 40694.0001843024. Note that the first 3 decimals coincide. The cubic root of 1656001651 is about 1183.0967331147.

The spelling of 1656001651 in words is "one billion, six hundred fifty-six million, one thousand, six hundred fifty-one".