16121457280 has 64 divisors (see below), whose sum is σ = 39869382600. Its totient is φ = 6226210816.

The previous prime is 16121457271. The next prime is 16121457283. The reversal of 16121457280 is 8275412161.

It can be written as a sum of positive squares in 4 ways, for example, as 12087683136 + 4033774144 = 109944^2 + 63512^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (16121457283) 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, 415747 + ... + 452866.

Almost surely, 2^16121457280 is an apocalyptic number.

16121457280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16121457280 is an abundant number, since it is smaller than the sum of its proper divisors (23747925320).

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

16121457280 is an equidigital number, since it uses as much as digits as its factorization.

16121457280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868661 (or 868649 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The spelling of 16121457280 in words is "sixteen billion, one hundred twenty-one million, four hundred fifty-seven thousand, two hundred eighty".