23665220400 has 120 divisors (see below), whose sum is σ = 75855481744. Its totient is φ = 6306739200.

The previous prime is 23665220351. The next prime is 23665220437. The reversal of 23665220400 is 402256632.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2227902 + ... + 2238498.

Almost surely, 2^23665220400 is an apocalyptic number.

23665220400 is a gapful number since it is divisible by the number (20) 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 23665220400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37927740872).

23665220400 is an abundant number, since it is smaller than the sum of its proper divisors (52190261344).

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

23665220400 is a wasteful number, since it uses less digits than its factorization.

23665220400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12479 (or 12468 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The spelling of 23665220400 in words is "twenty-three billion, six hundred sixty-five million, two hundred twenty thousand, four hundred".