2660526989 has 4 divisors (see below), whose sum is σ = 2667366780. Its totient is φ = 2653687200.

The previous prime is 2660526931. The next prime is 2660526991. The reversal of 2660526989 is 9896250662.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 403326889 + 2257200100 = 20083^2 + 47510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2660526989 is a prime.

It is a super-2 number, since 2×2660526989² = 14156807718394812242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2660526989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2660528989) 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 in 3 ways as a sum of consecutive naturals, for example, 3419312 + ... + 3420089.

It is an arithmetic number, because the mean of its divisors is an integer number (666841695).

Almost surely, 2^2660526989 is an apocalyptic number.

It is an amenable number.

2660526989 is a deficient number, since it is larger than the sum of its proper divisors (6839791).

2660526989 is an equidigital number, since it uses as much as digits as its factorization.

2660526989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6839790.

The product of its (nonzero) digits is 2799360, while the sum is 53.

The square root of 2660526989 is about 51580.2965191167. The cubic root of 2660526989 is about 1385.6574772003.

The spelling of 2660526989 in words is "two billion, six hundred sixty million, five hundred twenty-six thousand, nine hundred eighty-nine".