2687661629 has 2 divisors, whose sum is σ = 2687661630. Its totient is φ = 2687661628.

The previous prime is 2687661601. The next prime is 2687661649. The reversal of 2687661629 is 9261667862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1420159225 + 1267502404 = 37685^2 + 35602^2 .

It is a cyclic number.

It is not a de Polignac number, because 2687661629 - 2⁸ = 2687661373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2687661649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343830814 + 1343830815.

It is an arithmetic number, because the mean of its divisors is an integer number (1343830815).

Almost surely, 2^2687661629 is an apocalyptic number.

It is an amenable number.

2687661629 is a deficient number, since it is larger than the sum of its proper divisors (1).

2687661629 is an equidigital number, since it uses as much as digits as its factorization.

2687661629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 53.

The square root of 2687661629 is about 51842.6622483838. The cubic root of 2687661629 is about 1390.3523129164.

The spelling of 2687661629 in words is "two billion, six hundred eighty-seven million, six hundred sixty-one thousand, six hundred twenty-nine".