16645464012400 has 120 divisors (see below), whose sum is σ = 40266198048384. Its totient is φ = 6612393004800.

The previous prime is 16645464012391. The next prime is 16645464012431. The reversal of 16645464012400 is 421046454661.

It is a happy number.

16645464012400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 74905455 + ... + 75127345.

Almost surely, 2^{16645464012400} is an apocalyptic number.

16645464012400 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 16645464012400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20133099024192).

16645464012400 is an abundant number, since it is smaller than the sum of its proper divisors (23620734035984).

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

16645464012400 is a wasteful number, since it uses less digits than its factorization.

16645464012400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223199 (or 223188 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 43.

The spelling of 16645464012400 in words is "sixteen trillion, six hundred forty-five billion, four hundred sixty-four million, twelve thousand, four hundred".