2665942329601 has 4 divisors (see below), whose sum is σ = 2665952572932. Its totient is φ = 2665932086272.

The previous prime is 2665942329593. The next prime is 2665942329613. The reversal of 2665942329601 is 1069232495662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 95935770225 + 2570006559376 = 309735^2 + 1603124^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665942329601 - 2³ = 2665942329593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2665942329641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4720816 + ... + 5255281.

It is an arithmetic number, because the mean of its divisors is an integer number (666488143233).

Almost surely, 2^{2665942329601} is an apocalyptic number.

It is an amenable number.

2665942329601 is a deficient number, since it is larger than the sum of its proper divisors (10243331).

2665942329601 is an equidigital number, since it uses as much as digits as its factorization.

2665942329601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10243330.

The product of its (nonzero) digits is 8398080, while the sum is 55.

The spelling of 2665942329601 in words is "two trillion, six hundred sixty-five billion, nine hundred forty-two million, three hundred twenty-nine thousand, six hundred one".