216782377845 has 64 divisors (see below), whose sum is σ = 388740992256. Its totient is φ = 102231521280.

The previous prime is 216782377841. The next prime is 216782377859. The reversal of 216782377845 is 548773287612.

It is not a de Polignac number, because 216782377845 - 2² = 216782377841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216782377841) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34532847 + ... + 34539123.

It is an arithmetic number, because the mean of its divisors is an integer number (6074078004).

Almost surely, 2^216782377845 is an apocalyptic number.

It is an amenable number.

216782377845 is a deficient number, since it is larger than the sum of its proper divisors (171958614411).

216782377845 is a wasteful number, since it uses less digits than its factorization.

216782377845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11990.

The product of its digits is 31610880, while the sum is 60.

The spelling of 216782377845 in words is "two hundred sixteen billion, seven hundred eighty-two million, three hundred seventy-seven thousand, eight hundred forty-five".