2115999965 has 8 divisors (see below), whose sum is σ = 2540014848. Its totient is φ = 1692256720.

The previous prime is 2115999937. The next prime is 2115999983. The reversal of 2115999965 is 5699995112.

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

It is not a de Polignac number, because 2115999965 - 2¹⁴ = 2115983581 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2115999965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50357 + ... + 82266.

It is an arithmetic number, because the mean of its divisors is an integer number (317501856).

Almost surely, 2^2115999965 is an apocalyptic number.

It is an amenable number.

2115999965 is a deficient number, since it is larger than the sum of its proper divisors (424014883).

2115999965 is a wasteful number, since it uses less digits than its factorization.

2115999965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135819.

The product of its digits is 1968300, while the sum is 56.

The square root of 2115999965 is about 45999.9996195652. Note that the first 3 decimals coincide. The cubic root of 2115999965 is about 1283.8231975208.

The spelling of 2115999965 in words is "two billion, one hundred fifteen million, nine hundred ninety-nine thousand, nine hundred sixty-five".