15918027449 has 4 divisors (see below), whose sum is σ = 16096881780. Its totient is φ = 15739173120.

The previous prime is 15918027407. The next prime is 15918027479. The reversal of 15918027449 is 94472081951.

It is a happy number.

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 4193469049 + 11724558400 = 64757^2 + 108280^2 .

It is a cyclic number.

It is not a de Polignac number, because 15918027449 - 2³² = 11623060153 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15918027397 and 15918027406.

It is not an unprimeable number, because it can be changed into a prime (15918027479) 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 3 ways as a sum of consecutive naturals, for example, 89427032 + ... + 89427209.

It is an arithmetic number, because the mean of its divisors is an integer number (4024220445).

Almost surely, 2^15918027449 is an apocalyptic number.

It is an amenable number.

15918027449 is a deficient number, since it is larger than the sum of its proper divisors (178854331).

15918027449 is an equidigital number, since it uses as much as digits as its factorization.

15918027449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178854330.

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 15918027449 in words is "fifteen billion, nine hundred eighteen million, twenty-seven thousand, four hundred forty-nine".