16778487761 has 8 divisors (see below), whose sum is σ = 19259889600. Its totient is φ = 14318204688.

The previous prime is 16778487749. The next prime is 16778487767.

16778487761 is nontrivially palindromic in base 10.

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 16778487761 - 2⁶ = 16778487697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16778487694 and 16778487703.

It is not an unprimeable number, because it can be changed into a prime (16778487767) 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, 5277986 + ... + 5281163.

It is an arithmetic number, because the mean of its divisors is an integer number (2407486200).

Almost surely, 2^16778487761 is an apocalyptic number.

It is an amenable number.

16778487761 is a deficient number, since it is larger than the sum of its proper divisors (2481401839).

16778487761 is a wasteful number, since it uses less digits than its factorization.

16778487761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10559383.

The product of its digits is 22127616, while the sum is 62.

The spelling of 16778487761 in words is "sixteen billion, seven hundred seventy-eight million, four hundred eighty-seven thousand, seven hundred sixty-one".