1366621620 has 192 divisors, whose sum is σ = 4734481920. Its totient is φ = 286820352.

The previous prime is 1366621601. The next prime is 1366621637. The reversal of 1366621620 is 261266631.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1249794 + ... + 1250886.

It is an arithmetic number, because the mean of its divisors is an integer number (24658760).

Almost surely, 2^1366621620 is an apocalyptic number.

1366621620 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 1366621620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2367240960).

1366621620 is an abundant number, since it is smaller than the sum of its proper divisors (3367860300).

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

1366621620 is a wasteful number, since it uses less digits than its factorization.

1366621620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354 (or 1352 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 1366621620 is about 36967.8457581721. The cubic root of 1366621620 is about 1109.7268543067.

The spelling of 1366621620 in words is "one billion, three hundred sixty-six million, six hundred twenty-one thousand, six hundred twenty".