15945854399 has 4 divisors (see below), whose sum is σ = 15947336664. Its totient is φ = 15944372136.

The previous prime is 15945854387. The next prime is 15945854401. The reversal of 15945854399 is 99345854951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99345854951 = 7 ⋅14192264993.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15945854399 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 (15945854339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 724877 + ... + 746550.

It is an arithmetic number, because the mean of its divisors is an integer number (3986834166).

Almost surely, 2^15945854399 is an apocalyptic number.

15945854399 is a deficient number, since it is larger than the sum of its proper divisors (1482265).

15945854399 is a wasteful number, since it uses less digits than its factorization.

15945854399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482264.

The product of its digits is 34992000, while the sum is 62.

The spelling of 15945854399 in words is "fifteen billion, nine hundred forty-five million, eight hundred fifty-four thousand, three hundred ninety-nine".