1366256640 has 352 divisors, whose sum is σ = 5084158464. Its totient is φ = 306708480.

The previous prime is 1366256623. The next prime is 1366256651. The reversal of 1366256640 is 466526631.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10429375 + ... + 10429505.

It is an arithmetic number, because the mean of its divisors is an integer number (14443632).

Almost surely, 2^1366256640 is an apocalyptic number.

1366256640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1366256640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2542079232).

1366256640 is an abundant number, since it is smaller than the sum of its proper divisors (3717901824).

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

1366256640 is a wasteful number, since it uses less digits than its factorization.

1366256640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 1366256640 is about 36962.9089764320. The cubic root of 1366256640 is about 1109.6280549113.

The spelling of 1366256640 in words is "one billion, three hundred sixty-six million, two hundred fifty-six thousand, six hundred forty".