11865455320 has 64 divisors (see below), whose sum is σ = 28308722400. Its totient is φ = 4460513280.

The previous prime is 11865455317. The next prime is 11865455341. The reversal of 11865455320 is 2355456811.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 469815 + ... + 494425.

Almost surely, 2^11865455320 is an apocalyptic number.

11865455320 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 11865455320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14154361200).

11865455320 is an abundant number, since it is smaller than the sum of its proper divisors (16443267080).

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

11865455320 is a wasteful number, since it uses less digits than its factorization.

11865455320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25348 (or 25344 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 11865455320 in words is "eleven billion, eight hundred sixty-five million, four hundred fifty-five thousand, three hundred twenty".