216181831058377 has 4 divisors (see below), whose sum is σ = 217737096030160. Its totient is φ = 214626566086596.

The previous prime is 216181831058279. The next prime is 216181831058381. The reversal of 216181831058377 is 773850138181612.

216181831058377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-216181831058377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216181831058077) 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, 777632485683 + ... + 777632485960.

It is an arithmetic number, because the mean of its divisors is an integer number (54434274007540).

Almost surely, 2^{216181831058377} is an apocalyptic number.

It is an amenable number.

216181831058377 is a deficient number, since it is larger than the sum of its proper divisors (1555264971783).

216181831058377 is a wasteful number, since it uses less digits than its factorization.

216181831058377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555264971782.

The product of its (nonzero) digits is 13547520, while the sum is 61.

The spelling of 216181831058377 in words is "two hundred sixteen trillion, one hundred eighty-one billion, eight hundred thirty-one million, fifty-eight thousand, three hundred seventy-seven".