217393949896 has 8 divisors (see below), whose sum is σ = 407613656070. Its totient is φ = 108696974944.

The previous prime is 217393949869. The next prime is 217393949923. The reversal of 217393949896 is 698949393712.

It is an interprime number because it is at equal distance from previous prime (217393949869) and next prime (217393949923).

It can be written as a sum of positive squares in only one way, i.e., 207270772900 + 10123176996 = 455270^2 + 100614^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13587121861 + ... + 13587121876.

Almost surely, 2^217393949896 is an apocalyptic number.

It is an amenable number.

217393949896 is a deficient number, since it is larger than the sum of its proper divisors (190219706174).

217393949896 is a wasteful number, since it uses less digits than its factorization.

217393949896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27174243743 (or 27174243739 counting only the distinct ones).

The product of its digits is 158723712, while the sum is 70.

The spelling of 217393949896 in words is "two hundred seventeen billion, three hundred ninety-three million, nine hundred forty-nine thousand, eight hundred ninety-six".