217091006742 has 32 divisors (see below), whose sum is σ = 436054204512. Its totient is φ = 72052003584.

The previous prime is 217091006681. The next prime is 217091006767. The reversal of 217091006742 is 247600190712.

It is a self number, because there is not a number n which added to its sum of digits gives 217091006742.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2369938 + ... + 2459834.

It is an arithmetic number, because the mean of its divisors is an integer number (13626693891).

Almost surely, 2^217091006742 is an apocalyptic number.

217091006742 is an abundant number, since it is smaller than the sum of its proper divisors (218963197770).

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

217091006742 is a wasteful number, since it uses less digits than its factorization.

217091006742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91632.

The product of its (nonzero) digits is 42336, while the sum is 39.

The spelling of 217091006742 in words is "two hundred seventeen billion, ninety-one million, six thousand, seven hundred forty-two".