1366641985 has 24 divisors (see below), whose sum is σ = 1758594240. Its totient is φ = 1019268864.

The previous prime is 1366641977. The next prime is 1366642003. The reversal of 1366641985 is 5891466631.

It is not a de Polignac number, because 1366641985 - 2³ = 1366641977 is a prime.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 150196 + ... + 159034.

It is an arithmetic number, because the mean of its divisors is an integer number (73274760).

Almost surely, 2^1366641985 is an apocalyptic number.

It is an amenable number.

1366641985 is a deficient number, since it is larger than the sum of its proper divisors (391952255).

1366641985 is a wasteful number, since it uses less digits than its factorization.

1366641985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8985 (or 8968 counting only the distinct ones).

The product of its digits is 933120, while the sum is 49.

The square root of 1366641985 is about 36968.1211992170. The cubic root of 1366641985 is about 1109.7323665555.

The spelling of 1366641985 in words is "one billion, three hundred sixty-six million, six hundred forty-one thousand, nine hundred eighty-five".