264665566191 has 16 divisors (see below), whose sum is σ = 382281331040. Its totient is φ = 162871113600.

The previous prime is 264665566183. The next prime is 264665566199. The reversal of 264665566191 is 191665566462.

It is an interprime number because it is at equal distance from previous prime (264665566183) and next prime (264665566199).

It is not a de Polignac number, because 264665566191 - 2³ = 264665566183 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 (264665566199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20071210 + ... + 20084391.

It is an arithmetic number, because the mean of its divisors is an integer number (23892583190).

Almost surely, 2^264665566191 is an apocalyptic number.

264665566191 is a deficient number, since it is larger than the sum of its proper divisors (117615764849).

264665566191 is an equidigital number, since it uses as much as digits as its factorization.

264665566191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40155643 (or 40155617 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 57.

The spelling of 264665566191 in words is "two hundred sixty-four billion, six hundred sixty-five million, five hundred sixty-six thousand, one hundred ninety-one".