15825049849 has 24 divisors (see below), whose sum is σ = 19021532928. Its totient is φ = 13113666720.

The previous prime is 15825049847. The next prime is 15825049853. The reversal of 15825049849 is 94894052851.

It is not a de Polignac number, because 15825049849 - 2¹ = 15825049847 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15825049849.

It is not an unprimeable number, because it can be changed into a prime (15825049847) 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, 1701199 + ... + 1710475.

It is an arithmetic number, because the mean of its divisors is an integer number (792563872).

Almost surely, 2^15825049849 is an apocalyptic number.

It is an amenable number.

15825049849 is a deficient number, since it is larger than the sum of its proper divisors (3196483079).

15825049849 is a wasteful number, since it uses less digits than its factorization.

15825049849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10445 (or 10438 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 55.

It can be divided in two parts, 1582 and 5049849, that added together give a triangular number (5051431 = T₃₁₇₈).

The spelling of 15825049849 in words is "fifteen billion, eight hundred twenty-five million, forty-nine thousand, eight hundred forty-nine".