2661726731 has 2 divisors, whose sum is σ = 2661726732. Its totient is φ = 2661726730.

The previous prime is 2661726719. The next prime is 2661726733. The reversal of 2661726731 is 1376271662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2661726731 - 2¹⁴ = 2661710347 is a prime.

It is a super-2 number, since 2×2661726731² = 14169578381039892722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 2661726733, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2661726733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330863365 + 1330863366.

It is an arithmetic number, because the mean of its divisors is an integer number (1330863366).

Almost surely, 2^2661726731 is an apocalyptic number.

2661726731 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661726731 is an equidigital number, since it uses as much as digits as its factorization.

2661726731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 41.

The square root of 2661726731 is about 51591.9250561558. The cubic root of 2661726731 is about 1385.8657293820.

The spelling of 2661726731 in words is "two billion, six hundred sixty-one million, seven hundred twenty-six thousand, seven hundred thirty-one".