2665856766215 has 8 divisors (see below), whose sum is σ = 3387206244240. Its totient is φ = 2007233329792.

The previous prime is 2665856766191. The next prime is 2665856766259. The reversal of 2665856766215 is 5126676585662.

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

It is a cyclic number.

It is not a de Polignac number, because 2665856766215 - 2¹² = 2665856762119 is a prime.

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, 15681510305 + ... + 15681510474.

It is an arithmetic number, because the mean of its divisors is an integer number (423400780530).

Almost surely, 2^{2665856766215} is an apocalyptic number.

2665856766215 is a deficient number, since it is larger than the sum of its proper divisors (721349478025).

2665856766215 is a wasteful number, since it uses less digits than its factorization.

2665856766215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31363020801.

The product of its digits is 217728000, while the sum is 65.

The spelling of 2665856766215 in words is "two trillion, six hundred sixty-five billion, eight hundred fifty-six million, seven hundred sixty-six thousand, two hundred fifteen".