2600659987 has 2 divisors, whose sum is σ = 2600659988. Its totient is φ = 2600659986.

The previous prime is 2600659981. The next prime is 2600660003. The reversal of 2600659987 is 7899560062.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2600659987 - 2¹⁵ = 2600627219 is a prime.

It is not a weakly prime, because it can be changed into another prime (2600659981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1300329993 + 1300329994.

It is an arithmetic number, because the mean of its divisors is an integer number (1300329994).

Almost surely, 2^2600659987 is an apocalyptic number.

2600659987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2600659987 is an equidigital number, since it uses as much as digits as its factorization.

2600659987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 2600659987 is about 50996.6664302678. Note that the first 3 decimals coincide. The cubic root of 2600659987 is about 1375.1852069200.

The spelling of 2600659987 in words is "two billion, six hundred million, six hundred fifty-nine thousand, nine hundred eighty-seven".