16778749845 has 128 divisors (see below), whose sum is σ = 34474180608. Its totient is φ = 6839193600.

The previous prime is 16778749829. The next prime is 16778749847. The reversal of 16778749845 is 54894787761.

It is not a de Polignac number, because 16778749845 - 2⁴ = 16778749829 is a prime.

It is a super-2 number, since 2×16778749845² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16778749847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1122994 + ... + 1137836.

It is an arithmetic number, because the mean of its divisors is an integer number (269329536).

Almost surely, 2^16778749845 is an apocalyptic number.

16778749845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16778749845 is an abundant number, since it is smaller than the sum of its proper divisors (17695430763).

16778749845 is a wasteful number, since it uses less digits than its factorization.

16778749845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14923.

The product of its digits is 94832640, while the sum is 66.

The spelling of 16778749845 in words is "sixteen billion, seven hundred seventy-eight million, seven hundred forty-nine thousand, eight hundred forty-five".