16621257380 has 96 divisors (see below), whose sum is σ = 45220680960. Its totient is φ = 4983482880.

The previous prime is 16621257371. The next prime is 16621257421. The reversal of 16621257380 is 8375212661.

16621257380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 205751 + ... + 274910.

It is an arithmetic number, because the mean of its divisors is an integer number (471048760).

Almost surely, 2^16621257380 is an apocalyptic number.

16621257380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16621257380 is an abundant number, since it is smaller than the sum of its proper divisors (28599423580).

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

16621257380 is a wasteful number, since it uses less digits than its factorization.

16621257380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480709 (or 480707 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 16621257380 in words is "sixteen billion, six hundred twenty-one million, two hundred fifty-seven thousand, three hundred eighty".