216373715582551 has 32 divisors (see below), whose sum is σ = 233009654980608. Its totient is φ = 200188942356480.

The previous prime is 216373715582543. The next prime is 216373715582579. The reversal of 216373715582551 is 155285517373612.

It is a cyclic number.

It is not a de Polignac number, because 216373715582551 - 2³ = 216373715582543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216373715582551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216373715582851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5923646850 + ... + 5923683376.

It is an arithmetic number, because the mean of its divisors is an integer number (7281551718144).

Almost surely, 2^{216373715582551} is an apocalyptic number.

216373715582551 is a deficient number, since it is larger than the sum of its proper divisors (16635939398057).

216373715582551 is a wasteful number, since it uses less digits than its factorization.

216373715582551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50871.

The product of its digits is 52920000, while the sum is 61.

The spelling of 216373715582551 in words is "two hundred sixteen trillion, three hundred seventy-three billion, seven hundred fifteen million, five hundred eighty-two thousand, five hundred fifty-one".