15615656913049 has 4 divisors (see below), whose sum is σ = 15617540368080. Its totient is φ = 15613773458020.

The previous prime is 15615656913011. The next prime is 15615656913107. The reversal of 15615656913049 is 94031965651651.

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 15615656913049 - 2²¹ = 15615654815897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15615656943049) 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, 941715079 + ... + 941731660.

It is an arithmetic number, because the mean of its divisors is an integer number (3904385092020).

Almost surely, 2^{15615656913049} is an apocalyptic number.

It is an amenable number.

15615656913049 is a deficient number, since it is larger than the sum of its proper divisors (1883455031).

15615656913049 is an equidigital number, since it uses as much as digits as its factorization.

15615656913049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883455030.

The product of its (nonzero) digits is 26244000, while the sum is 61.

The spelling of 15615656913049 in words is "fifteen trillion, six hundred fifteen billion, six hundred fifty-six million, nine hundred thirteen thousand, forty-nine".