221694449765 has 16 divisors (see below), whose sum is σ = 280046808000. Its totient is φ = 168014028672.

The previous prime is 221694449759. The next prime is 221694449777. The reversal of 221694449765 is 567944496122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221694449765 - 2¹⁰ = 221694448741 is a prime.

It is a super-2 number, since 2×221694449765² (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 15 ways as a sum of consecutive naturals, for example, 3947774 + ... + 4003536.

It is an arithmetic number, because the mean of its divisors is an integer number (17502925500).

Almost surely, 2^221694449765 is an apocalyptic number.

It is an amenable number.

221694449765 is a deficient number, since it is larger than the sum of its proper divisors (58352358235).

221694449765 is a wasteful number, since it uses less digits than its factorization.

221694449765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97636.

The product of its digits is 26127360, while the sum is 59.

The spelling of 221694449765 in words is "two hundred twenty-one billion, six hundred ninety-four million, four hundred forty-nine thousand, seven hundred sixty-five".