15894449851 has 12 divisors (see below), whose sum is σ = 18989214832. Its totient is φ = 13031471376.

The previous prime is 15894449849. The next prime is 15894449903.

15894449851 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 15894449851 - 2¹ = 15894449849 is a prime.

It is a super-3 number, since 3×15894449851³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (15894449551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2142456 + ... + 2149861.

Almost surely, 2^15894449851 is an apocalyptic number.

15894449851 is a deficient number, since it is larger than the sum of its proper divisors (3094764981).

15894449851 is an equidigital number, since it uses as much as digits as its factorization.

15894449851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4292370 (or 4292347 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 58.

The spelling of 15894449851 in words is "fifteen billion, eight hundred ninety-four million, four hundred forty-nine thousand, eight hundred fifty-one".