2666156839 has 2 divisors, whose sum is σ = 2666156840. Its totient is φ = 2666156838.

The previous prime is 2666156813. The next prime is 2666156861. The reversal of 2666156839 is 9386516662.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2666156839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2666154839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333078419 + 1333078420.

It is an arithmetic number, because the mean of its divisors is an integer number (1333078420).

Almost surely, 2^2666156839 is an apocalyptic number.

2666156839 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666156839 is an equidigital number, since it uses as much as digits as its factorization.

2666156839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 52.

The square root of 2666156839 is about 51634.8413283124. The cubic root of 2666156839 is about 1386.6341693786.

The spelling of 2666156839 in words is "two billion, six hundred sixty-six million, one hundred fifty-six thousand, eight hundred thirty-nine".