1291868650611 has 54 divisors (see below), whose sum is σ = 2368171512252. Its totient is φ = 671059473840.

The previous prime is 1291868650519. The next prime is 1291868650627. The reversal of 1291868650611 is 1160568681921.

1291868650611 is a `hidden beast` number, since 1 + 2 + 9 + 18 + 6 + 8 + 6 + 5 + 0 + 611 = 666.

It is not a de Polignac number, because 1291868650611 - 2²¹ = 1291866553459 is a prime.

It is a super-2 number, since 2×1291868650611² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1291868650211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 79155310 + ... + 79171628.

Almost surely, 2^{1291868650611} is an apocalyptic number.

1291868650611 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1291868650611 is a deficient number, since it is larger than the sum of its proper divisors (1076302861641).

1291868650611 is an frugal number, since it uses more digits than its factorization.

1291868650611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32669 (or 16340 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The spelling of 1291868650611 in words is "one trillion, two hundred ninety-one billion, eight hundred sixty-eight million, six hundred fifty thousand, six hundred eleven".