1366669881 has 8 divisors (see below), whose sum is σ = 2024696160. Its totient is φ = 911113236.

The previous prime is 1366669873. The next prime is 1366669883. The reversal of 1366669881 is 1889666631.

It is not a de Polignac number, because 1366669881 - 2³ = 1366669873 is a prime.

It is a super-2 number, since 2×1366669881² = 3735573127265108322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1366669883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25308675 + ... + 25308728.

It is an arithmetic number, because the mean of its divisors is an integer number (253087020).

Almost surely, 2^1366669881 is an apocalyptic number.

It is an amenable number.

1366669881 is a deficient number, since it is larger than the sum of its proper divisors (658026279).

1366669881 is an equidigital number, since it uses as much as digits as its factorization.

1366669881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50617412 (or 50617406 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 1366669881 is about 36968.4984953406. The cubic root of 1366669881 is about 1109.7399171512.

The spelling of 1366669881 in words is "one billion, three hundred sixty-six million, six hundred sixty-nine thousand, eight hundred eighty-one".