16531474823440 has 40 divisors (see below), whose sum is σ = 38438166853440. Its totient is φ = 6612161905536.

The previous prime is 16531474823419. The next prime is 16531474823443. The reversal of 16531474823440 is 4432847413561.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (16531474823443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5442780 + ... + 7917499.

It is an arithmetic number, because the mean of its divisors is an integer number (960954171336).

Almost surely, 2^{16531474823440} is an apocalyptic number.

16531474823440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16531474823440 is an abundant number, since it is smaller than the sum of its proper divisors (21906692030000).

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

16531474823440 is a wasteful number, since it uses less digits than its factorization.

16531474823440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13375759 (or 13375753 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 52.

The spelling of 16531474823440 in words is "sixteen trillion, five hundred thirty-one billion, four hundred seventy-four million, eight hundred twenty-three thousand, four hundred forty".