16921541677 has 4 divisors (see below), whose sum is σ = 16923313756. Its totient is φ = 16919769600.

The previous prime is 16921541671. The next prime is 16921541713. The reversal of 16921541677 is 77614512961.

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 13649015241 + 3272526436 = 116829^2 + 57206^2 .

It is a cyclic number.

It is not a de Polignac number, because 16921541677 - 2¹⁹ = 16921017389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16921541677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16921541671) 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, 871638 + ... + 890839.

It is an arithmetic number, because the mean of its divisors is an integer number (4230828439).

Almost surely, 2^16921541677 is an apocalyptic number.

It is an amenable number.

16921541677 is a deficient number, since it is larger than the sum of its proper divisors (1772079).

16921541677 is an equidigital number, since it uses as much as digits as its factorization.

16921541677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772078.

The product of its digits is 635040, while the sum is 49.

The spelling of 16921541677 in words is "sixteen billion, nine hundred twenty-one million, five hundred forty-one thousand, six hundred seventy-seven".