1136666681 has 4 divisors (see below), whose sum is σ = 1138230912. Its totient is φ = 1135102452.

The previous prime is 1136666651. The next prime is 1136666689. The reversal of 1136666681 is 1866666311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1866666311 = 109 ⋅17125379.

It is a cyclic number.

It is not a de Polignac number, because 1136666681 - 2⁶ = 1136666617 is a prime.

It is a super-2 number, since 2×1136666681² = 2584022287391111522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1136666689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781025 + ... + 782478.

It is an arithmetic number, because the mean of its divisors is an integer number (284557728).

Almost surely, 2^1136666681 is an apocalyptic number.

It is an amenable number.

1136666681 is a deficient number, since it is larger than the sum of its proper divisors (1564231).

1136666681 is an equidigital number, since it uses as much as digits as its factorization.

1136666681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564230.

The product of its digits is 186624, while the sum is 44.

The square root of 1136666681 is about 33714.4877018768. The cubic root of 1136666681 is about 1043.6247657553.

The spelling of 1136666681 in words is "one billion, one hundred thirty-six million, six hundred sixty-six thousand, six hundred eighty-one".