1651660651 has 2 divisors, whose sum is σ = 1651660652. Its totient is φ = 1651660650.

The previous prime is 1651660639. The next prime is 1651660669. The reversal of 1651660651 is 1560661561.

It is a weak prime.

It is an emirp because it is prime and its reverse (1560661561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1651660651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1651660651.

It is not a weakly prime, because it can be changed into another prime (1651660051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825830325 + 825830326.

It is an arithmetic number, because the mean of its divisors is an integer number (825830326).

Almost surely, 2^1651660651 is an apocalyptic number.

1651660651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651660651 is an equidigital number, since it uses as much as digits as its factorization.

1651660651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1651660651 is about 40640.6280832371. The cubic root of 1651660651 is about 1182.0620487391.

The spelling of 1651660651 in words is "one billion, six hundred fifty-one million, six hundred sixty thousand, six hundred fifty-one".