16605674977 has 4 divisors (see below), whose sum is σ = 16606473156. Its totient is φ = 16604876800.

The previous prime is 16605674971. The next prime is 16605674989. The reversal of 16605674977 is 77947650661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77947650661 = 38201 ⋅2040461.

It can be written as a sum of positive squares in 2 ways, for example, as 9549002961 + 7056672016 = 97719^2 + 84004^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16605674977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16605674971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367024 + ... + 409777.

It is an arithmetic number, because the mean of its divisors is an integer number (4151618289).

Almost surely, 2^16605674977 is an apocalyptic number.

It is an amenable number.

16605674977 is a deficient number, since it is larger than the sum of its proper divisors (798179).

16605674977 is an equidigital number, since it uses as much as digits as its factorization.

16605674977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798178.

The product of its (nonzero) digits is 13335840, while the sum is 58.

The spelling of 16605674977 in words is "sixteen billion, six hundred five million, six hundred seventy-four thousand, nine hundred seventy-seven".