16991669227140 has 144 divisors (see below), whose sum is σ = 51609328675632. Its totient is φ = 4525142704128.

The previous prime is 16991669227069. The next prime is 16991669227147. The reversal of 16991669227140 is 4172296619961.

16991669227140 is a `hidden beast` number, since 169 + 9 + 166 + 9 + 2 + 271 + 40 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 75689913924 + 16915979313216 = 275118^2 + 4112904^2 .

It is not an unprimeable number, because it can be changed into a prime (16991669227147) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 649093732 + ... + 649119908.

It is an arithmetic number, because the mean of its divisors is an integer number (358398115803).

Almost surely, 2^{16991669227140} is an apocalyptic number.

16991669227140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16991669227140 is an abundant number, since it is smaller than the sum of its proper divisors (34617659448492).

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

16991669227140 is a wasteful number, since it uses less digits than its factorization.

16991669227140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30806 (or 30801 counting only the distinct ones).

The product of its (nonzero) digits is 17635968, while the sum is 63.

The spelling of 16991669227140 in words is "sixteen trillion, nine hundred ninety-one billion, six hundred sixty-nine million, two hundred twenty-seven thousand, one hundred forty".