1866226681 has 12 divisors (see below), whose sum is σ = 2053747696. Its totient is φ = 1694551320.

The previous prime is 1866226673. The next prime is 1866226709.

1866226681 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1866226681 - 2³ = 1866226673 is a prime.

It is a super-2 number, since 2×1866226681² = 6965604049752551522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1866226081) 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, 98110 + ... + 115576.

Almost surely, 2^1866226681 is an apocalyptic number.

1866226681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1866226681 is a deficient number, since it is larger than the sum of its proper divisors (187521015).

1866226681 is a wasteful number, since it uses less digits than its factorization.

1866226681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18372 (or 18361 counting only the distinct ones).

The product of its digits is 331776, while the sum is 46.

The square root of 1866226681 is about 43199.8458446324. The cubic root of 1866226681 is about 1231.1797526947.

The spelling of 1866226681 in words is "one billion, eight hundred sixty-six million, two hundred twenty-six thousand, six hundred eighty-one".