66353571652 has 12 divisors (see below), whose sum is σ = 116625820780. Its totient is φ = 33031908576.

The previous prime is 66353571643. The next prime is 66353571659. The reversal of 66353571652 is 25617535366.

It can be written as a sum of positive squares in 2 ways, for example, as 64198383876 + 2155187776 = 253374^2 + 46424^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66353571596 and 66353571605.

It is not an unprimeable number, because it can be changed into a prime (66353571659) 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, 36218283 + ... + 36220114.

Almost surely, 2^66353571652 is an apocalyptic number.

It is an amenable number.

66353571652 is a deficient number, since it is larger than the sum of its proper divisors (50272249128).

66353571652 is a wasteful number, since it uses less digits than its factorization.

66353571652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72438630 (or 72438628 counting only the distinct ones).

The product of its digits is 3402000, while the sum is 49.

The spelling of 66353571652 in words is "sixty-six billion, three hundred fifty-three million, five hundred seventy-one thousand, six hundred fifty-two".