216861623071 has 16 divisors (see below), whose sum is σ = 231016320000. Its totient is φ = 203570379264.

The previous prime is 216861623063. The next prime is 216861623093. The reversal of 216861623071 is 170326168612.

It is not a de Polignac number, because 216861623071 - 2³ = 216861623063 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 (216861623051) 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, 1824055 + ... + 1939303.

It is an arithmetic number, because the mean of its divisors is an integer number (14438520000).

Almost surely, 2^216861623071 is an apocalyptic number.

216861623071 is a deficient number, since it is larger than the sum of its proper divisors (14154696929).

216861623071 is an equidigital number, since it uses as much as digits as its factorization.

216861623071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115683 (or 115649 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 216861623071 in words is "two hundred sixteen billion, eight hundred sixty-one million, six hundred twenty-three thousand, seventy-one".