217399890754 has 4 divisors (see below), whose sum is σ = 326099836134. Its totient is φ = 108699945376.

The previous prime is 217399890713. The next prime is 217399890769. The reversal of 217399890754 is 457098993712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 127894210129 + 89505680625 = 357623^2 + 299175^2 .

It is a super-2 number, since 2×217399890754² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54349972687 + ... + 54349972690.

Almost surely, 2^217399890754 is an apocalyptic number.

217399890754 is a deficient number, since it is larger than the sum of its proper divisors (108699945380).

217399890754 is a wasteful number, since it uses less digits than its factorization.

217399890754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108699945379.

The product of its (nonzero) digits is 34292160, while the sum is 64.

The spelling of 217399890754 in words is "two hundred seventeen billion, three hundred ninety-nine million, eight hundred ninety thousand, seven hundred fifty-four".