216045214670581 has 4 divisors (see below), whose sum is σ = 217746358093312. Its totient is φ = 214344071247852.

The previous prime is 216045214670539. The next prime is 216045214670639. The reversal of 216045214670581 is 185076412540612.

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 216045214670581 - 2²¹ = 216045212573429 is a prime.

It is a super-2 number, since 2×216045214670581² (a number of 29 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 (216045214670281) 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, 850571711175 + ... + 850571711428.

It is an arithmetic number, because the mean of its divisors is an integer number (54436589523328).

Almost surely, 2^{216045214670581} is an apocalyptic number.

It is an amenable number.

216045214670581 is a deficient number, since it is larger than the sum of its proper divisors (1701143422731).

216045214670581 is a wasteful number, since it uses less digits than its factorization.

216045214670581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701143422730.

The product of its (nonzero) digits is 3225600, while the sum is 52.

The spelling of 216045214670581 in words is "two hundred sixteen trillion, forty-five billion, two hundred fourteen million, six hundred seventy thousand, five hundred eighty-one".