2666891959 has 2 divisors, whose sum is σ = 2666891960. Its totient is φ = 2666891958.

The previous prime is 2666891917. The next prime is 2666891977. The reversal of 2666891959 is 9591986662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2666891959 - 2⁷ = 2666891831 is a prime.

It is a super-2 number, since 2×2666891959² = 14224625441957715362, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2666891897 and 2666891906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2666898959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333445979 + 1333445980.

It is an arithmetic number, because the mean of its divisors is an integer number (1333445980).

Almost surely, 2^2666891959 is an apocalyptic number.

2666891959 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666891959 is an equidigital number, since it uses as much as digits as its factorization.

2666891959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12597120, while the sum is 61.

The square root of 2666891959 is about 51641.9592869984. The cubic root of 2666891959 is about 1386.7615998464.

The spelling of 2666891959 in words is "two billion, six hundred sixty-six million, eight hundred ninety-one thousand, nine hundred fifty-nine".