216890970837 has 4 divisors (see below), whose sum is σ = 289187961120. Its totient is φ = 144593980556.

The previous prime is 216890970787. The next prime is 216890970871. The reversal of 216890970837 is 738079098612.

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 216890970837 - 2⁸ = 216890970581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216890970937) 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 3 ways as a sum of consecutive naturals, for example, 36148495137 + ... + 36148495142.

It is an arithmetic number, because the mean of its divisors is an integer number (72296990280).

Almost surely, 2^216890970837 is an apocalyptic number.

It is an amenable number.

216890970837 is a deficient number, since it is larger than the sum of its proper divisors (72296990283).

216890970837 is an equidigital number, since it uses as much as digits as its factorization.

216890970837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72296990282.

The product of its (nonzero) digits is 9144576, while the sum is 60.

The spelling of 216890970837 in words is "two hundred sixteen billion, eight hundred ninety million, nine hundred seventy thousand, eight hundred thirty-seven".