16977440657 has 4 divisors (see below), whose sum is σ = 17297769780. Its totient is φ = 16657111536.

The previous prime is 16977440647. The next prime is 16977440659. The reversal of 16977440657 is 75604477961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75604477961 = 17 ⋅4447322233.

It can be written as a sum of positive squares in 2 ways, for example, as 5156532481 + 11820908176 = 71809^2 + 108724^2 .

It is a cyclic number.

It is not a de Polignac number, because 16977440657 - 2¹² = 16977436561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16977440659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160164482 + ... + 160164587.

It is an arithmetic number, because the mean of its divisors is an integer number (4324442445).

Almost surely, 2^16977440657 is an apocalyptic number.

It is an amenable number.

16977440657 is a deficient number, since it is larger than the sum of its proper divisors (320329123).

16977440657 is an equidigital number, since it uses as much as digits as its factorization.

16977440657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320329122.

The product of its (nonzero) digits is 8890560, while the sum is 56.

The spelling of 16977440657 in words is "sixteen billion, nine hundred seventy-seven million, four hundred forty thousand, six hundred fifty-seven".