2165255551087 has 8 divisors (see below), whose sum is σ = 2166868172304. Its totient is φ = 2163643267968.

The previous prime is 2165255551003. The next prime is 2165255551097. The reversal of 2165255551087 is 7801555525612.

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 2165255551087 - 2¹⁹ = 2165255026799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165255551097) 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, 13539063 + ... + 13698055.

It is an arithmetic number, because the mean of its divisors is an integer number (270858521538).

Almost surely, 2^{2165255551087} is an apocalyptic number.

2165255551087 is a deficient number, since it is larger than the sum of its proper divisors (1612621217).

2165255551087 is a wasteful number, since it uses less digits than its factorization.

2165255551087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169049.

The product of its (nonzero) digits is 4200000, while the sum is 52.

The spelling of 2165255551087 in words is "two trillion, one hundred sixty-five billion, two hundred fifty-five million, five hundred fifty-one thousand, eighty-seven".