2566667179749 has 4 divisors (see below), whose sum is σ = 3422222906336. Its totient is φ = 1711111453164.

The previous prime is 2566667179717. The next prime is 2566667179837. The reversal of 2566667179749 is 9479717666652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2566667179749 - 2⁵ = 2566667179717 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 (2566667177749) 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, 427777863289 + ... + 427777863294.

It is an arithmetic number, because the mean of its divisors is an integer number (855555726584).

Almost surely, 2^{2566667179749} is an apocalyptic number.

It is an amenable number.

2566667179749 is a deficient number, since it is larger than the sum of its proper divisors (855555726587).

2566667179749 is an equidigital number, since it uses as much as digits as its factorization.

2566667179749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855555726586.

The product of its digits is 1440270720, while the sum is 75.

The spelling of 2566667179749 in words is "two trillion, five hundred sixty-six billion, six hundred sixty-seven million, one hundred seventy-nine thousand, seven hundred forty-nine".