217481740434 has 72 divisors (see below), whose sum is σ = 565824849408. Its totient is φ = 60133192560.

The previous prime is 217481740373. The next prime is 217481740453. The reversal of 217481740434 is 434047184712.

217481740434 is a `hidden beast` number, since 2 + 1 + 7 + 48 + 174 + 0 + 434 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 217481740434.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3949722 + ... + 4004405.

It is an arithmetic number, because the mean of its divisors is an integer number (7858678464).

Almost surely, 2^217481740434 is an apocalyptic number.

217481740434 is an abundant number, since it is smaller than the sum of its proper divisors (348343108974).

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

217481740434 is a wasteful number, since it uses less digits than its factorization.

217481740434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7954180 (or 7954170 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 45.

The spelling of 217481740434 in words is "two hundred seventeen billion, four hundred eighty-one million, seven hundred forty thousand, four hundred thirty-four".