2605165761631 has 4 divisors (see below), whose sum is σ = 2605172530672. Its totient is φ = 2605158992592.

The previous prime is 2605165761629. The next prime is 2605165761641. The reversal of 2605165761631 is 1361675615062.

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

It is a cyclic number.

It is not a de Polignac number, because 2605165761631 - 2¹ = 2605165761629 is a prime.

It is a super-2 number, since 2×2605165761631² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2605165761641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2770035 + ... + 3589348.

It is an arithmetic number, because the mean of its divisors is an integer number (651293132668).

Almost surely, 2^{2605165761631} is an apocalyptic number.

2605165761631 is a deficient number, since it is larger than the sum of its proper divisors (6769041).

2605165761631 is an equidigital number, since it uses as much as digits as its factorization.

2605165761631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6769040.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 2605165761631 in words is "two trillion, six hundred five billion, one hundred sixty-five million, seven hundred sixty-one thousand, six hundred thirty-one".