11421663660 has 192 divisors, whose sum is σ = 38857512960. Its totient is φ = 2762242560.

The previous prime is 11421663641. The next prime is 11421663661. The reversal of 11421663660 is 6636612411.

It is a happy number.

11421663660 is a `hidden beast` number, since 1 + 1 + 4 + 2 + 16 + 636 + 6 + 0 = 666.

It is a super-4 number, since 4×11421663660⁴ (a number of 41 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (11421663661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2748144 + ... + 2752296.

It is an arithmetic number, because the mean of its divisors is an integer number (202382880).

Almost surely, 2^11421663660 is an apocalyptic number.

11421663660 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 11421663660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19428756480).

11421663660 is an abundant number, since it is smaller than the sum of its proper divisors (27435849300).

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

11421663660 is a wasteful number, since it uses less digits than its factorization.

11421663660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4645 (or 4637 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 11421663660 in words is "eleven billion, four hundred twenty-one million, six hundred sixty-three thousand, six hundred sixty".