1646242799 has 4 divisors (see below), whose sum is σ = 1646442336. Its totient is φ = 1646043264.

The previous prime is 1646242789. The next prime is 1646242837. The reversal of 1646242799 is 9972426461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1646242799 - 2²⁰ = 1645194223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646242709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86834 + ... + 104079.

It is an arithmetic number, because the mean of its divisors is an integer number (411610584).

Almost surely, 2^1646242799 is an apocalyptic number.

1646242799 is a deficient number, since it is larger than the sum of its proper divisors (199537).

1646242799 is an equidigital number, since it uses as much as digits as its factorization.

1646242799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199536.

The product of its digits is 1306368, while the sum is 50.

The square root of 1646242799 is about 40573.9177181598. The cubic root of 1646242799 is about 1180.7681484637.

The spelling of 1646242799 in words is "one billion, six hundred forty-six million, two hundred forty-two thousand, seven hundred ninety-nine".