16778140666677 has 48 divisors (see below), whose sum is σ = 28587501437040. Its totient is φ = 9382564509696.

The previous prime is 16778140666591. The next prime is 16778140666681. The reversal of 16778140666677 is 77666604187761.

It can be written as a sum of positive squares in 8 ways, for example, as 966709769796 + 15811430896881 = 983214^2 + 3976359^2 .

It is not a de Polignac number, because 16778140666677 - 2¹⁰ = 16778140665653 is a prime.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16778140666277) 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, 145381378 + ... + 145496739.

It is an arithmetic number, because the mean of its divisors is an integer number (595572946605).

Almost surely, 2^{16778140666677} is an apocalyptic number.

16778140666677 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

16778140666677 is a deficient number, since it is larger than the sum of its proper divisors (11809360770363).

16778140666677 is a wasteful number, since it uses less digits than its factorization.

16778140666677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290878182 (or 290878179 counting only the distinct ones).

The product of its (nonzero) digits is 597445632, while the sum is 72.

The spelling of 16778140666677 in words is "sixteen trillion, seven hundred seventy-eight billion, one hundred forty million, six hundred sixty-six thousand, six hundred seventy-seven".