66475427650 has 24 divisors (see below), whose sum is σ = 124157364804. Its totient is φ = 26479833600.

The previous prime is 66475427633. The next prime is 66475427657. The reversal of 66475427650 is 5672457466.

It can be written as a sum of positive squares in 6 ways, for example, as 10198778121 + 56276649529 = 100989^2 + 237227^2 .

It is not an unprimeable number, because it can be changed into a prime (66475427657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2746267 + ... + 2770366.

Almost surely, 2^66475427650 is an apocalyptic number.

66475427650 is a deficient number, since it is larger than the sum of its proper divisors (57681937154).

66475427650 is a wasteful number, since it uses less digits than its factorization.

66475427650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5516886 (or 5516881 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 52.

The spelling of 66475427650 in words is "sixty-six billion, four hundred seventy-five million, four hundred twenty-seven thousand, six hundred fifty".