66574473556 has 6 divisors (see below), whose sum is σ = 116505328730. Its totient is φ = 33287236776.

The previous prime is 66574473547. The next prime is 66574473569. The reversal of 66574473556 is 65537447566.

It can be written as a sum of positive squares in only one way, i.e., 45467032900 + 21107440656 = 213230^2 + 145284^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66574473556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8321809191 + ... + 8321809198.

Almost surely, 2^66574473556 is an apocalyptic number.

It is an amenable number.

66574473556 is a deficient number, since it is larger than the sum of its proper divisors (49930855174).

66574473556 is a wasteful number, since it uses less digits than its factorization.

66574473556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16643618393 (or 16643618391 counting only the distinct ones).

The product of its digits is 63504000, while the sum is 58.

The spelling of 66574473556 in words is "sixty-six billion, five hundred seventy-four million, four hundred seventy-three thousand, five hundred fifty-six".