16429431649 has 4 divisors (see below), whose sum is σ = 16524399636. Its totient is φ = 16334463664.

The previous prime is 16429431619. The next prime is 16429431673. The reversal of 16429431649 is 94613492461.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7200371025 + 9229060624 = 84855^2 + 96068^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16429431649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16429431619) 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, 47483734 + ... + 47484079.

It is an arithmetic number, because the mean of its divisors is an integer number (4131099909).

Almost surely, 2^16429431649 is an apocalyptic number.

It is an amenable number.

16429431649 is a deficient number, since it is larger than the sum of its proper divisors (94967987).

16429431649 is an equidigital number, since it uses as much as digits as its factorization.

16429431649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94967986.

The product of its digits is 1119744, while the sum is 49.

The spelling of 16429431649 in words is "sixteen billion, four hundred twenty-nine million, four hundred thirty-one thousand, six hundred forty-nine".