2156015617 has 4 divisors (see below), whose sum is σ = 2464017856. Its totient is φ = 1848013380.

The previous prime is 2156015597. The next prime is 2156015639. The reversal of 2156015617 is 7165106512.

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 2156015617 - 2¹⁵ = 2155982849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2156015117) 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, 154001109 + ... + 154001122.

It is an arithmetic number, because the mean of its divisors is an integer number (616004464).

Almost surely, 2^2156015617 is an apocalyptic number.

It is an amenable number.

2156015617 is a deficient number, since it is larger than the sum of its proper divisors (308002239).

2156015617 is an equidigital number, since it uses as much as digits as its factorization.

2156015617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308002238.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 2156015617 is about 46432.9152326235. The cubic root of 2156015617 is about 1291.8655013799.

The spelling of 2156015617 in words is "two billion, one hundred fifty-six million, fifteen thousand, six hundred seventeen".