216671516597 has 4 divisors (see below), whose sum is σ = 221710389120. Its totient is φ = 211632644076.

The previous prime is 216671516533. The next prime is 216671516599. The reversal of 216671516597 is 795615176612.

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 216671516597 - 2⁶ = 216671516533 is a prime.

It is a super-2 number, since 2×216671516597² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216671516599) 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, 2519436197 + ... + 2519436282.

It is an arithmetic number, because the mean of its divisors is an integer number (55427597280).

Almost surely, 2^216671516597 is an apocalyptic number.

It is an amenable number.

216671516597 is a deficient number, since it is larger than the sum of its proper divisors (5038872523).

216671516597 is an equidigital number, since it uses as much as digits as its factorization.

216671516597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5038872522.

The product of its digits is 4762800, while the sum is 56.

The spelling of 216671516597 in words is "two hundred sixteen billion, six hundred seventy-one million, five hundred sixteen thousand, five hundred ninety-seven".