16677325645621 has 4 divisors (see below), whose sum is σ = 17402426760672. Its totient is φ = 15952224530572.

The previous prime is 16677325645613. The next prime is 16677325645681. The reversal of 16677325645621 is 12654652377661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16677325645621 - 2³ = 16677325645613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16677325645621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16677325645681) 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, 362550557491 + ... + 362550557536.

It is an arithmetic number, because the mean of its divisors is an integer number (4350606690168).

Almost surely, 2^{16677325645621} is an apocalyptic number.

It is an amenable number.

16677325645621 is a deficient number, since it is larger than the sum of its proper divisors (725101115051).

16677325645621 is an equidigital number, since it uses as much as digits as its factorization.

16677325645621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725101115050.

The product of its digits is 76204800, while the sum is 61.

The spelling of 16677325645621 in words is "sixteen trillion, six hundred seventy-seven billion, three hundred twenty-five million, six hundred forty-five thousand, six hundred twenty-one".