15916891449 has 8 divisors (see below), whose sum is σ = 21223363392. Its totient is φ = 10610840240.

The previous prime is 15916891433. The next prime is 15916891477. The reversal of 15916891449 is 94419861951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15916891449 - 2⁴ = 15916891433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15916891429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2622 + ... + 178439.

It is an arithmetic number, because the mean of its divisors is an integer number (2652920424).

Almost surely, 2^15916891449 is an apocalyptic number.

It is an amenable number.

15916891449 is a deficient number, since it is larger than the sum of its proper divisors (5306471943).

15916891449 is a wasteful number, since it uses less digits than its factorization.

15916891449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210367.

The product of its digits is 2799360, while the sum is 57.

The spelling of 15916891449 in words is "fifteen billion, nine hundred sixteen million, eight hundred ninety-one thousand, four hundred forty-nine".