16545720216400 has 60 divisors (see below), whose sum is σ = 40102872511932. Its totient is φ = 6559719147520.

The previous prime is 16545720216391. The next prime is 16545720216439. The reversal of 16545720216400 is 461202754561.

It can be written as a sum of positive squares in 6 ways, for example, as 8591018929936 + 7954701286464 = 2931044^2 + 2820408^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 182982679 + ... + 183073078.

Almost surely, 2^{16545720216400} is an apocalyptic number.

16545720216400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16545720216400 is an abundant number, since it is smaller than the sum of its proper divisors (23557152295532).

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

16545720216400 is a wasteful number, since it uses less digits than its factorization.

16545720216400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366055888 (or 366055877 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 43.

The spelling of 16545720216400 in words is "sixteen trillion, five hundred forty-five billion, seven hundred twenty million, two hundred sixteen thousand, four hundred".