11665617600 has 672 divisors, whose sum is σ = 49907805696. Its totient is φ = 2315059200.

The previous prime is 11665617589. The next prime is 11665617661. The reversal of 11665617600 is 671656611.

It is a tau number, because it is divible by the number of its divisors (672).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7424815 + ... + 7426385.

It is an arithmetic number, because the mean of its divisors is an integer number (74267568).

Almost surely, 2^11665617600 is an apocalyptic number.

11665617600 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 11665617600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24953902848).

11665617600 is an abundant number, since it is smaller than the sum of its proper divisors (38242188096).

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

11665617600 is a wasteful number, since it uses less digits than its factorization.

11665617600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633 (or 1618 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The spelling of 11665617600 in words is "eleven billion, six hundred sixty-five million, six hundred seventeen thousand, six hundred".