1645990079 has 2 divisors, whose sum is σ = 1645990080. Its totient is φ = 1645990078.

The previous prime is 1645990067. The next prime is 1645990081. The reversal of 1645990079 is 9700995461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1645990079 - 2⁴ = 1645990063 is a prime.

Together with 1645990081, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645990019) 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, 822995039 + 822995040.

It is an arithmetic number, because the mean of its divisors is an integer number (822995040).

Almost surely, 2^1645990079 is an apocalyptic number.

1645990079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645990079 is an equidigital number, since it uses as much as digits as its factorization.

1645990079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 1645990079 is about 40570.8032826564. The cubic root of 1645990079 is about 1180.7077242060.

The spelling of 1645990079 in words is "one billion, six hundred forty-five million, nine hundred ninety thousand, seventy-nine".