654613225666 has 8 divisors (see below), whose sum is σ = 991641817404. Its totient is φ = 324065953200.

The previous prime is 654613225633. The next prime is 654613225667. The reversal of 654613225666 is 666522316456.

It can be written as a sum of positive squares in 2 ways, for example, as 530973085041 + 123640140625 = 728679^2 + 351625^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×654613225666² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (654613225667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1620329565 + ... + 1620329968.

Almost surely, 2^654613225666 is an apocalyptic number.

654613225666 is a deficient number, since it is larger than the sum of its proper divisors (337028591738).

654613225666 is a wasteful number, since it uses less digits than its factorization.

654613225666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3240659636.

The product of its digits is 9331200, while the sum is 52.

The spelling of 654613225666 in words is "six hundred fifty-four billion, six hundred thirteen million, two hundred twenty-five thousand, six hundred sixty-six".