2660526991 has 2 divisors, whose sum is σ = 2660526992. Its totient is φ = 2660526990.

The previous prime is 2660526931. The next prime is 2660526997. The reversal of 2660526991 is 1996250662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2660526991 - 2¹⁷ = 2660395919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2660526997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330263495 + 1330263496.

It is an arithmetic number, because the mean of its divisors is an integer number (1330263496).

Almost surely, 2^2660526991 is an apocalyptic number.

2660526991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2660526991 is an equidigital number, since it uses as much as digits as its factorization.

2660526991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 2660526991 is about 51580.2965385039. The cubic root of 2660526991 is about 1385.6574775476.

The spelling of 2660526991 in words is "two billion, six hundred sixty million, five hundred twenty-six thousand, nine hundred ninety-one".