217493619992 has 32 divisors (see below), whose sum is σ = 444989468880. Its totient is φ = 98834924160.

The previous prime is 217493619991. The next prime is 217493620021. The reversal of 217493619992 is 299916394712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217493619991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18338 + ... + 659790.

Almost surely, 2^217493619992 is an apocalyptic number.

217493619992 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

217493619992 is an abundant number, since it is smaller than the sum of its proper divisors (227495848888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217493619992 is a wasteful number, since it uses less digits than its factorization.

217493619992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645323 (or 645319 counting only the distinct ones).

The product of its digits is 13226976, while the sum is 62.

The spelling of 217493619992 in words is "two hundred seventeen billion, four hundred ninety-three million, six hundred nineteen thousand, nine hundred ninety-two".