2665125666501 has 16 divisors (see below), whose sum is σ = 3582318073728. Its totient is φ = 1762376616000.

The previous prime is 2665125666473. The next prime is 2665125666559. The reversal of 2665125666501 is 1056665215662.

It is not a de Polignac number, because 2665125666501 - 2²⁵ = 2665092112069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665125666001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4038430 + ... + 4651791.

It is an arithmetic number, because the mean of its divisors is an integer number (223894879608).

Almost surely, 2^{2665125666501} is an apocalyptic number.

It is an amenable number.

2665125666501 is a deficient number, since it is larger than the sum of its proper divisors (917192407227).

2665125666501 is a wasteful number, since it uses less digits than its factorization.

2665125666501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8691052.

The product of its (nonzero) digits is 3888000, while the sum is 51.

The spelling of 2665125666501 in words is "two trillion, six hundred sixty-five billion, one hundred twenty-five million, six hundred sixty-six thousand, five hundred one".