16994494431 has 24 divisors (see below), whose sum is σ = 26081583840. Its totient is φ = 10663184448.

The previous prime is 16994494427. The next prime is 16994494493. The reversal of 16994494431 is 13449449961.

16994494431 is a `hidden beast` number, since 1 + 69 + 94 + 494 + 4 + 3 + 1 = 666.

It is not a de Polignac number, because 16994494431 - 2² = 16994494427 is a prime.

It is a super-2 number, since 2×16994494431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16994494631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 147955 + ... + 236388.

It is an arithmetic number, because the mean of its divisors is an integer number (1086732660).

Almost surely, 2^16994494431 is an apocalyptic number.

16994494431 is a deficient number, since it is larger than the sum of its proper divisors (9087089409).

16994494431 is an equidigital number, since it uses as much as digits as its factorization.

16994494431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384400 (or 384363 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 54.

The spelling of 16994494431 in words is "sixteen billion, nine hundred ninety-four million, four hundred ninety-four thousand, four hundred thirty-one".