1366351638 has 8 divisors (see below), whose sum is σ = 2732703288. Its totient is φ = 455450544.

The previous prime is 1366351633. The next prime is 1366351661. The reversal of 1366351638 is 8361536631.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

1366351638 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1366351638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366351633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113862631 + ... + 113862642.

It is an arithmetic number, because the mean of its divisors is an integer number (341587911).

Almost surely, 2^1366351638 is an apocalyptic number.

1366351638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1366351638 is a wasteful number, since it uses less digits than its factorization.

1366351638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227725278.

The product of its digits is 233280, while the sum is 42.

The square root of 1366351638 is about 36964.1939990581. The cubic root of 1366351638 is about 1109.6537723839.

The spelling of 1366351638 in words is "one billion, three hundred sixty-six million, three hundred fifty-one thousand, six hundred thirty-eight".