16668542397 has 8 divisors (see below), whose sum is σ = 23934317344. Its totient is φ = 10257564528.

The previous prime is 16668542389. The next prime is 16668542399. The reversal of 16668542397 is 79324586661.

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

It is not a de Polignac number, because 16668542397 - 2³ = 16668542389 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 (16668542399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213699223 + ... + 213699300.

It is an arithmetic number, because the mean of its divisors is an integer number (2991789668).

Almost surely, 2^16668542397 is an apocalyptic number.

It is an amenable number.

16668542397 is a deficient number, since it is larger than the sum of its proper divisors (7265774947).

16668542397 is a wasteful number, since it uses less digits than its factorization.

16668542397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427398539.

The product of its digits is 13063680, while the sum is 57.

The spelling of 16668542397 in words is "sixteen billion, six hundred sixty-eight million, five hundred forty-two thousand, three hundred ninety-seven".