217715047542 has 12 divisors (see below), whose sum is σ = 471715936380. Its totient is φ = 72571682508.

The previous prime is 217715047447. The next prime is 217715047553. The reversal of 217715047542 is 245740517712.

It is a happy number.

217715047542 is a `hidden beast` number, since 2 + 1 + 7 + 71 + 504 + 75 + 4 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6047640192 + ... + 6047640227.

It is an arithmetic number, because the mean of its divisors is an integer number (39309661365).

Almost surely, 2^217715047542 is an apocalyptic number.

217715047542 is an abundant number, since it is smaller than the sum of its proper divisors (254000888838).

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

217715047542 is a wasteful number, since it uses less digits than its factorization.

217715047542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12095280427 (or 12095280424 counting only the distinct ones).

The product of its (nonzero) digits is 548800, while the sum is 45.

The spelling of 217715047542 in words is "two hundred seventeen billion, seven hundred fifteen million, forty-seven thousand, five hundred forty-two".