221766473007 has 6 divisors (see below), whose sum is σ = 320329349912. Its totient is φ = 147844315332.

The previous prime is 221766472997. The next prime is 221766473143. The reversal of 221766473007 is 700374667122.

221766473007 is a `hidden beast` number, since 2 + 2 + 176 + 6 + 473 + 0 + 0 + 7 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-221766473007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221766472007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12320359603 + ... + 12320359620.

Almost surely, 2^221766473007 is an apocalyptic number.

221766473007 is a deficient number, since it is larger than the sum of its proper divisors (98562876905).

221766473007 is a wasteful number, since it uses less digits than its factorization.

221766473007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24640719229 (or 24640719226 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 45.

The spelling of 221766473007 in words is "two hundred twenty-one billion, seven hundred sixty-six million, four hundred seventy-three thousand, seven".