16634355343661 has 16 divisors (see below), whose sum is σ = 18357459357888. Its totient is φ = 14946909792000.

The previous prime is 16634355343579. The next prime is 16634355343679.

16634355343661 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 16634355343661 - 2³⁴ = 16617175474477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16634355343597 and 16634355343606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16634355343261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12101180 + ... + 13405493.

It is an arithmetic number, because the mean of its divisors is an integer number (1147341209868).

Almost surely, 2^{16634355343661} is an apocalyptic number.

16634355343661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16634355343661 is a deficient number, since it is larger than the sum of its proper divisors (1723104014227).

16634355343661 is a wasteful number, since it uses less digits than its factorization.

16634355343661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25507372.

The product of its digits is 41990400, while the sum is 56.

The spelling of 16634355343661 in words is "sixteen trillion, six hundred thirty-four billion, three hundred fifty-five million, three hundred forty-three thousand, six hundred sixty-one".