215715611249 has 4 divisors (see below), whose sum is σ = 217007321664. Its totient is φ = 214423900836.

The previous prime is 215715611239. The next prime is 215715611261. The reversal of 215715611249 is 942116517512.

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 215715611249 - 2⁴ = 215715611233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215715611239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645854957 + ... + 645855290.

It is an arithmetic number, because the mean of its divisors is an integer number (54251830416).

Almost surely, 2^215715611249 is an apocalyptic number.

It is an amenable number.

215715611249 is a deficient number, since it is larger than the sum of its proper divisors (1291710415).

215715611249 is a wasteful number, since it uses less digits than its factorization.

215715611249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291710414.

The product of its digits is 151200, while the sum is 44.

The spelling of 215715611249 in words is "two hundred fifteen billion, seven hundred fifteen million, six hundred eleven thousand, two hundred forty-nine".