16993578945 has 64 divisors (see below), whose sum is σ = 32042594304. Its totient is φ = 7529882880.

The previous prime is 16993578941. The next prime is 16993579019. The reversal of 16993578945 is 54987539961.

It is not a de Polignac number, because 16993578945 - 2² = 16993578941 is a prime.

It is a super-3 number, since 3×16993578945³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16993578941) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 443500 + ... + 480290.

It is an arithmetic number, because the mean of its divisors is an integer number (500665536).

Almost surely, 2^16993578945 is an apocalyptic number.

16993578945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16993578945 is a deficient number, since it is larger than the sum of its proper divisors (15049015359).

16993578945 is a wasteful number, since it uses less digits than its factorization.

16993578945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36942.

The product of its digits is 73483200, while the sum is 66.

The spelling of 16993578945 in words is "sixteen billion, nine hundred ninety-three million, five hundred seventy-eight thousand, nine hundred forty-five".