16557577355677 has 8 divisors (see below), whose sum is σ = 16577808712920. Its totient is φ = 16537353856320.

The previous prime is 16557577355659. The next prime is 16557577355719. The reversal of 16557577355677 is 77655377575561.

It can be written as a sum of positive squares in 4 ways, for example, as 2290533929401 + 14267043426276 = 1513451^2 + 3777174^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16557577355677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16557577355377) 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, 2257899 + ... + 6181687.

It is an arithmetic number, because the mean of its divisors is an integer number (2072226089115).

Almost surely, 2^{16557577355677} is an apocalyptic number.

It is an amenable number.

16557577355677 is a deficient number, since it is larger than the sum of its proper divisors (20231357243).

16557577355677 is a wasteful number, since it uses less digits than its factorization.

16557577355677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3928943.

The product of its digits is 5672362500, while the sum is 76.

The spelling of 16557577355677 in words is "sixteen trillion, five hundred fifty-seven billion, five hundred seventy-seven million, three hundred fifty-five thousand, six hundred seventy-seven".