16681918346077 has 8 divisors (see below), whose sum is σ = 16849392208992. Its totient is φ = 16514489706000.

The previous prime is 16681918346021. The next prime is 16681918346081. The reversal of 16681918346077 is 77064381918661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16681918346077 - 2²⁷ = 16681784128349 is a prime.

It is a super-2 number, since 2×16681918346077² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16681918346087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10563999 + ... + 12040012.

It is an arithmetic number, because the mean of its divisors is an integer number (2106174026124).

Almost surely, 2^{16681918346077} is an apocalyptic number.

It is an amenable number.

16681918346077 is a deficient number, since it is larger than the sum of its proper divisors (167473862915).

16681918346077 is a wasteful number, since it uses less digits than its factorization.

16681918346077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22611419.

The product of its (nonzero) digits is 73156608, while the sum is 67.

The spelling of 16681918346077 in words is "sixteen trillion, six hundred eighty-one billion, nine hundred eighteen million, three hundred forty-six thousand, seventy-seven".