15905118049 has 4 divisors (see below), whose sum is σ = 16243524864. Its totient is φ = 15566711236.

The previous prime is 15905118023. The next prime is 15905118133. The reversal of 15905118049 is 94081150951.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15905118049 - 2¹¹ = 15905116001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15905117996 and 15905118014.

It is not an unprimeable number, because it can be changed into a prime (15905118949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169203337 + ... + 169203430.

It is an arithmetic number, because the mean of its divisors is an integer number (4060881216).

Almost surely, 2^15905118049 is an apocalyptic number.

It is an amenable number.

15905118049 is a deficient number, since it is larger than the sum of its proper divisors (338406815).

15905118049 is an equidigital number, since it uses as much as digits as its factorization.

15905118049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338406814.

The product of its (nonzero) digits is 64800, while the sum is 43.

The spelling of 15905118049 in words is "fifteen billion, nine hundred five million, one hundred eighteen thousand, forty-nine".