216304532551 has 4 divisors (see below), whose sum is σ = 216311040400. Its totient is φ = 216298024704.

The previous prime is 216304532471. The next prime is 216304532557. The reversal of 216304532551 is 155235403612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216304532551 - 2³⁵ = 181944794183 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 216304532551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216304532557) 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, 3203811 + ... + 3270628.

It is an arithmetic number, because the mean of its divisors is an integer number (54077760100).

Almost surely, 2^216304532551 is an apocalyptic number.

216304532551 is a deficient number, since it is larger than the sum of its proper divisors (6507849).

216304532551 is an equidigital number, since it uses as much as digits as its factorization.

216304532551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6507848.

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 216304532551 in words is "two hundred sixteen billion, three hundred four million, five hundred thirty-two thousand, five hundred fifty-one".