16634861399 has 8 divisors (see below), whose sum is σ = 18857333040. Its totient is φ = 14547085056.

The previous prime is 16634861333. The next prime is 16634861401. The reversal of 16634861399 is 99316843661.

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 16634861399 - 2⁸ = 16634861143 is a prime.

It is a super-2 number, since 2×16634861399² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16634161399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33673562 + ... + 33674055.

It is an arithmetic number, because the mean of its divisors is an integer number (2357166630).

Almost surely, 2^16634861399 is an apocalyptic number.

16634861399 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

16634861399 is a deficient number, since it is larger than the sum of its proper divisors (2222471641).

16634861399 is a wasteful number, since it uses less digits than its factorization.

16634861399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67347649.

The product of its digits is 5038848, while the sum is 56.

The spelling of 16634861399 in words is "sixteen billion, six hundred thirty-four million, eight hundred sixty-one thousand, three hundred ninety-nine".