1291686807627 has 12 divisors (see below), whose sum is σ = 1865833227544. Its totient is φ = 861095279520.

The previous prime is 1291686807611. The next prime is 1291686807641. The reversal of 1291686807627 is 7267086861921.

It is not a de Polignac number, because 1291686807627 - 2⁴ = 1291686807611 is a prime.

It is a super-2 number, since 2×1291686807627² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1291686805627) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2156938 + ... + 2689935.

Almost surely, 2^{1291686807627} is an apocalyptic number.

1291686807627 is a deficient number, since it is larger than the sum of its proper divisors (574146419917).

1291686807627 is a wasteful number, since it uses less digits than its factorization.

1291686807627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4876490 (or 4876487 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 63.

The spelling of 1291686807627 in words is "one trillion, two hundred ninety-one billion, six hundred eighty-six million, eight hundred seven thousand, six hundred twenty-seven".