1291062565906 has 16 divisors (see below), whose sum is σ = 2050833834360. Its totient is φ = 607463239680.

The previous prime is 1291062565901. The next prime is 1291062565921. The reversal of 1291062565906 is 6095652601921.

It can be written as a sum of positive squares in 4 ways, for example, as 1002183190281 + 288879375625 = 1001091^2 + 537475^2 .

It is not an unprimeable number, because it can be changed into a prime (1291062565901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2768511 + ... + 3201058.

Almost surely, 2^{1291062565906} is an apocalyptic number.

1291062565906 is a deficient number, since it is larger than the sum of its proper divisors (759771268454).

1291062565906 is a wasteful number, since it uses less digits than its factorization.

1291062565906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5975949.

The product of its (nonzero) digits is 1749600, while the sum is 52.

The spelling of 1291062565906 in words is "one trillion, two hundred ninety-one billion, sixty-two million, five hundred sixty-five thousand, nine hundred six".