1650656412991 has 2 divisors, whose sum is σ = 1650656412992. Its totient is φ = 1650656412990.

The previous prime is 1650656412989. The next prime is 1650656413039. The reversal of 1650656412991 is 1992146560561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1650656412991 - 2¹ = 1650656412989 is a prime.

Together with 1650656412989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1650656412931) 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, 825328206495 + 825328206496.

It is an arithmetic number, because the mean of its divisors is an integer number (825328206496).

Almost surely, 2^{1650656412991} is an apocalyptic number.

1650656412991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1650656412991 is an equidigital number, since it uses as much as digits as its factorization.

1650656412991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3499200, while the sum is 55.

The spelling of 1650656412991 in words is "one trillion, six hundred fifty billion, six hundred fifty-six million, four hundred twelve thousand, nine hundred ninety-one".