16523440000 has 80 divisors (see below), whose sum is σ = 41134270320. Its totient is φ = 6609344000.

The previous prime is 16523439979. The next prime is 16523440009. The reversal of 16523440000 is 4432561.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16523440009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 23272 + ... + 183271.

It is an arithmetic number, because the mean of its divisors is an integer number (514178379).

Almost surely, 2^16523440000 is an apocalyptic number.

16523440000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16523440000 is an abundant number, since it is smaller than the sum of its proper divisors (24610830320).

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

16523440000 is an frugal number, since it uses more digits than its factorization.

16523440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206577 (or 206550 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 16523440000 its reverse (4432561), we get a palindrome (16527872561).

The spelling of 16523440000 in words is "sixteen billion, five hundred twenty-three million, four hundred forty thousand".