16979889290445 has 144 divisors (see below), whose sum is σ = 32413469390640. Its totient is φ = 8509163083776.

The previous prime is 16979889290437. The next prime is 16979889290459. The reversal of 16979889290445 is 54409298897961.

16979889290445 is a `hidden beast` number, since 1 + 6 + 9 + 7 + 9 + 8 + 89 + 2 + 90 + 445 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 4827714206436 + 12152175084009 = 2197206^2 + 3485997^2 .

It is not a de Polignac number, because 16979889290445 - 2³ = 16979889290437 is a prime.

It is a Smith number, since the sum of its digits (81) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 341836071 + ... + 341885739.

It is an arithmetic number, because the mean of its divisors is an integer number (225093537435).

Almost surely, 2^{16979889290445} is an apocalyptic number.

16979889290445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16979889290445 is a deficient number, since it is larger than the sum of its proper divisors (15433580100195).

16979889290445 is an frugal number, since it uses more digits than its factorization.

16979889290445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50328 (or 50307 counting only the distinct ones).

The product of its (nonzero) digits is 2821754880, while the sum is 81.

The spelling of 16979889290445 in words is "sixteen trillion, nine hundred seventy-nine billion, eight hundred eighty-nine million, two hundred ninety thousand, four hundred forty-five".