16571684734661 has 8 divisors (see below), whose sum is σ = 18939104722560. Its totient is φ = 14204273860368.

The previous prime is 16571684734573. The next prime is 16571684734679. The reversal of 16571684734661 is 16643748617561.

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

It is a cyclic number.

It is not a de Polignac number, because 16571684734661 - 2³⁴ = 16554504865477 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 (16571284734661) 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, 2206655 + ... + 6165443.

It is an arithmetic number, because the mean of its divisors is an integer number (2367388090320).

Almost surely, 2^{16571684734661} is an apocalyptic number.

It is an amenable number.

16571684734661 is a deficient number, since it is larger than the sum of its proper divisors (2367419987899).

16571684734661 is an equidigital number, since it uses as much as digits as its factorization.

16571684734661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4556803.

The product of its digits is 121927680, while the sum is 65.

The spelling of 16571684734661 in words is "sixteen trillion, five hundred seventy-one billion, six hundred eighty-four million, seven hundred thirty-four thousand, six hundred sixty-one".