216137770361 has 4 divisors (see below), whose sum is σ = 216183268224. Its totient is φ = 216092272500.

The previous prime is 216137770339. The next prime is 216137770369. The reversal of 216137770361 is 163077731612.

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 216137770361 - 2¹⁸ = 216137508217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216137770369) 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, 22741805 + ... + 22751306.

It is an arithmetic number, because the mean of its divisors is an integer number (54045817056).

Almost surely, 2^216137770361 is an apocalyptic number.

It is an amenable number.

216137770361 is a deficient number, since it is larger than the sum of its proper divisors (45497863).

216137770361 is an equidigital number, since it uses as much as digits as its factorization.

216137770361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45497862.

The product of its (nonzero) digits is 222264, while the sum is 44.

The spelling of 216137770361 in words is "two hundred sixteen billion, one hundred thirty-seven million, seven hundred seventy thousand, three hundred sixty-one".