216305623611 has 64 divisors (see below), whose sum is σ = 401081103360. Its totient is φ = 111929057280.

The previous prime is 216305623579. The next prime is 216305623627. The reversal of 216305623611 is 116326503612.

216305623611 is a `hidden beast` number, since 2 + 1 + 6 + 30 + 5 + 6 + 2 + 3 + 611 = 666.

It is not a de Polignac number, because 216305623611 - 2⁵ = 216305623579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216305623631) 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, 331885 + ... + 736721.

It is an arithmetic number, because the mean of its divisors is an integer number (6266892240).

Almost surely, 2^216305623611 is an apocalyptic number.

216305623611 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

216305623611 is a deficient number, since it is larger than the sum of its proper divisors (184775479749).

216305623611 is a wasteful number, since it uses less digits than its factorization.

216305623611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405121 (or 405115 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 216305623611 in words is "two hundred sixteen billion, three hundred five million, six hundred twenty-three thousand, six hundred eleven".