2664687989 has 2 divisors, whose sum is σ = 2664687990. Its totient is φ = 2664687988.

The previous prime is 2664687959. The next prime is 2664688043. The reversal of 2664687989 is 9897864662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2630664100 + 34023889 = 51290^2 + 5833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2664687989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2664687959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332343994 + 1332343995.

It is an arithmetic number, because the mean of its divisors is an integer number (1332343995).

Almost surely, 2^2664687989 is an apocalyptic number.

It is an amenable number.

2664687989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2664687989 is an equidigital number, since it uses as much as digits as its factorization.

2664687989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62705664, while the sum is 65.

The square root of 2664687989 is about 51620.6159300720. The cubic root of 2664687989 is about 1386.3794792172.

The spelling of 2664687989 in words is "two billion, six hundred sixty-four million, six hundred eighty-seven thousand, nine hundred eighty-nine".