216621739594 has 8 divisors (see below), whose sum is σ = 349927425540. Its totient is φ = 99979264416.

The previous prime is 216621739577. The next prime is 216621739627. The reversal of 216621739594 is 495937126612.

It can be written as a sum of positive squares in 2 ways, for example, as 210034307025 + 6587432569 = 458295^2 + 81163^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4165802659 + ... + 4165802710.

Almost surely, 2^216621739594 is an apocalyptic number.

216621739594 is a deficient number, since it is larger than the sum of its proper divisors (133305685946).

216621739594 is a wasteful number, since it uses less digits than its factorization.

216621739594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8331605384.

The product of its digits is 4898880, while the sum is 55.

The spelling of 216621739594 in words is "two hundred sixteen billion, six hundred twenty-one million, seven hundred thirty-nine thousand, five hundred ninety-four".