1091259806681 has 16 divisors (see below), whose sum is σ = 1199938682880. Its totient is φ = 984161137680.

The previous prime is 1091259806671. The next prime is 1091259806723. The reversal of 1091259806681 is 1866089521901.

It is a cyclic number.

It is not a de Polignac number, because 1091259806681 - 2⁶ = 1091259806617 is a prime.

It is a super-2 number, since 2×1091259806681² (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 (1091259806621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22270250 + ... + 22319196.

It is an arithmetic number, because the mean of its divisors is an integer number (74996167680).

Almost surely, 2^{1091259806681} is an apocalyptic number.

1091259806681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1091259806681 is a deficient number, since it is larger than the sum of its proper divisors (108678876199).

1091259806681 is a wasteful number, since it uses less digits than its factorization.

1091259806681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65044.

The product of its (nonzero) digits is 1866240, while the sum is 56.

The spelling of 1091259806681 in words is "one trillion, ninety-one billion, two hundred fifty-nine million, eight hundred six thousand, six hundred eighty-one".