2629661989 has 2 divisors, whose sum is σ = 2629661990. Its totient is φ = 2629661988.

The previous prime is 2629661987. The next prime is 2629662011. The reversal of 2629661989 is 9891669262.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2574040225 + 55621764 = 50735^2 + 7458^2 .

It is a cyclic number.

It is not a de Polignac number, because 2629661989 - 2¹ = 2629661987 is a prime.

It is a super-2 number, since 2×2629661989² = 13830244352782872242, which contains 22 as substring.

Together with 2629661987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2629661987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1314830994 + 1314830995.

It is an arithmetic number, because the mean of its divisors is an integer number (1314830995).

Almost surely, 2^2629661989 is an apocalyptic number.

It is an amenable number.

2629661989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2629661989 is an equidigital number, since it uses as much as digits as its factorization.

2629661989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5038848, while the sum is 58.

The square root of 2629661989 is about 51280.2300014343. The cubic root of 2629661989 is about 1380.2782448468.

The spelling of 2629661989 in words is "two billion, six hundred twenty-nine million, six hundred sixty-one thousand, nine hundred eighty-nine".