2157617234615 has 8 divisors (see below), whose sum is σ = 2589252754128. Its totient is φ = 1726019072640.

The previous prime is 2157617234611. The next prime is 2157617234639. The reversal of 2157617234615 is 5164327167512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2157617234615 - 2² = 2157617234611 is a prime.

It is a super-2 number, since 2×2157617234615² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157617234611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9212162 + ... + 9443471.

It is an arithmetic number, because the mean of its divisors is an integer number (323656594266).

Almost surely, 2^{2157617234615} is an apocalyptic number.

2157617234615 is a deficient number, since it is larger than the sum of its proper divisors (431635519513).

2157617234615 is a wasteful number, since it uses less digits than its factorization.

2157617234615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18678769.

The product of its digits is 2116800, while the sum is 50.

The spelling of 2157617234615 in words is "two trillion, one hundred fifty-seven billion, six hundred seventeen million, two hundred thirty-four thousand, six hundred fifteen".