1646140799 has 4 divisors (see below), whose sum is σ = 1646690520. Its totient is φ = 1645591080.

The previous prime is 1646140789. The next prime is 1646140813. The reversal of 1646140799 is 9970416461.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1646140799 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 (1646140709) 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, 270344 + ... + 276365.

It is an arithmetic number, because the mean of its divisors is an integer number (411672630).

Almost surely, 2^1646140799 is an apocalyptic number.

1646140799 is a deficient number, since it is larger than the sum of its proper divisors (549721).

1646140799 is an equidigital number, since it uses as much as digits as its factorization.

1646140799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549720.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 1646140799 is about 40572.6607335531. The cubic root of 1646140799 is about 1180.7437614497.

The spelling of 1646140799 in words is "one billion, six hundred forty-six million, one hundred forty thousand, seven hundred ninety-nine".