217138347064 has 32 divisors (see below), whose sum is σ = 430738030800. Its totient is φ = 102332885760.

The previous prime is 217138347037. The next prime is 217138347089. The reversal of 217138347064 is 460743831712.

It is a super-2 number, since 2×217138347064² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3595797 + ... + 3655684.

Almost surely, 2^217138347064 is an apocalyptic number.

It is an amenable number.

217138347064 is a deficient number, since it is larger than the sum of its proper divisors (213599683736).

217138347064 is a wasteful number, since it uses less digits than its factorization.

217138347064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7251703 (or 7251699 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 46.

The spelling of 217138347064 in words is "two hundred seventeen billion, one hundred thirty-eight million, three hundred forty-seven thousand, sixty-four".