216715387455 has 96 divisors (see below), whose sum is σ = 444391833600. Its totient is φ = 95592220416.

The previous prime is 216715387453. The next prime is 216715387459. The reversal of 216715387455 is 554783517612.

216715387455 is a `hidden beast` number, since 2 + 1 + 67 + 1 + 53 + 87 + 455 = 666.

It is not a de Polignac number, because 216715387455 - 2¹ = 216715387453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216715387453) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 16061722 + ... + 16075208.

It is an arithmetic number, because the mean of its divisors is an integer number (4629081600).

Almost surely, 2^216715387455 is an apocalyptic number.

216715387455 is an abundant number, since it is smaller than the sum of its proper divisors (227676446145).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216715387455 is a wasteful number, since it uses less digits than its factorization.

216715387455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15293 (or 15290 counting only the distinct ones).

The product of its digits is 7056000, while the sum is 54.

The spelling of 216715387455 in words is "two hundred sixteen billion, seven hundred fifteen million, three hundred eighty-seven thousand, four hundred fifty-five".