1366961285 has 8 divisors (see below), whose sum is σ = 1640593656. Its totient is φ = 1093408960.

The previous prime is 1366961249. The next prime is 1366961287. The reversal of 1366961285 is 5821696631.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 49126081 + 1317835204 = 7009^2 + 36302^2 .

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

It is not a de Polignac number, because 1366961285 - 2³⁰ = 293219461 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366961287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28067 + ... + 59343.

It is an arithmetic number, because the mean of its divisors is an integer number (205074207).

Almost surely, 2^1366961285 is an apocalyptic number.

It is an amenable number.

1366961285 is a deficient number, since it is larger than the sum of its proper divisors (273632371).

1366961285 is an equidigital number, since it uses as much as digits as its factorization.

1366961285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40023.

The product of its digits is 466560, while the sum is 47.

The square root of 1366961285 is about 36972.4395327114. The cubic root of 1366961285 is about 1109.8187851778.

The spelling of 1366961285 in words is "one billion, three hundred sixty-six million, nine hundred sixty-one thousand, two hundred eighty-five".