16660437474577 has 4 divisors (see below), whose sum is σ = 17942009588020. Its totient is φ = 15378865361136.

The previous prime is 16660437474553. The next prime is 16660437474623. The reversal of 16660437474577 is 77547473406661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3053420739216 + 13607016735361 = 1747404^2 + 3688769^2 .

It is a cyclic number.

It is not a de Polignac number, because 16660437474577 - 2⁷ = 16660437474449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16660437474547) 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, 640786056702 + ... + 640786056727.

It is an arithmetic number, because the mean of its divisors is an integer number (4485502397005).

Almost surely, 2^{16660437474577} is an apocalyptic number.

It is an amenable number.

16660437474577 is a deficient number, since it is larger than the sum of its proper divisors (1281572113443).

16660437474577 is a wasteful number, since it uses less digits than its factorization.

16660437474577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281572113442.

The product of its (nonzero) digits is 497871360, while the sum is 67.

The spelling of 16660437474577 in words is "sixteen trillion, six hundred sixty billion, four hundred thirty-seven million, four hundred seventy-four thousand, five hundred seventy-seven".