216621739593 has 12 divisors (see below), whose sum is σ = 357597792448. Its totient is φ = 123783851160.

The previous prime is 216621739577. The next prime is 216621739627. The reversal of 216621739593 is 395937126612.

216621739593 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 2 + 17 + 39 + 593 = 666.

It is not a de Polignac number, because 216621739593 - 2⁴ = 216621739577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216621739193) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1719220093 + ... + 1719220218.

Almost surely, 2^216621739593 is an apocalyptic number.

It is an amenable number.

216621739593 is a deficient number, since it is larger than the sum of its proper divisors (140976052855).

216621739593 is a wasteful number, since it uses less digits than its factorization.

216621739593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3438440324 (or 3438440321 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The spelling of 216621739593 in words is "two hundred sixteen billion, six hundred twenty-one million, seven hundred thirty-nine thousand, five hundred ninety-three".