16778725280 has 48 divisors (see below), whose sum is σ = 41971494600. Its totient is φ = 6316695552.

The previous prime is 16778725273. The next prime is 16778725307. The reversal of 16778725280 is 8252787761.

It can be written as a sum of positive squares in 4 ways, for example, as 15287838736 + 1490886544 = 123644^2 + 38612^2 .

It is a super-2 number, since 2×16778725280² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3081605 + ... + 3087044.

Almost surely, 2^16778725280 is an apocalyptic number.

16778725280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16778725280 is an abundant number, since it is smaller than the sum of its proper divisors (25192769320).

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

16778725280 is a wasteful number, since it uses less digits than its factorization.

16778725280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6168681 (or 6168673 counting only the distinct ones).

The product of its (nonzero) digits is 2634240, while the sum is 53.

The spelling of 16778725280 in words is "sixteen billion, seven hundred seventy-eight million, seven hundred twenty-five thousand, two hundred eighty".