66450745636 has 36 divisors (see below), whose sum is σ = 127948704156. Its totient is φ = 30174844480.

The previous prime is 66450745607. The next prime is 66450745693. The reversal of 66450745636 is 63654705466.

It can be written as a sum of positive squares in 2 ways, for example, as 22723753536 + 43726992100 = 150744^2 + 209110^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 422526 + ... + 558058.

It is an arithmetic number, because the mean of its divisors is an integer number (3554130671).

Almost surely, 2^66450745636 is an apocalyptic number.

It is an amenable number.

66450745636 is a deficient number, since it is larger than the sum of its proper divisors (61497958520).

66450745636 is a wasteful number, since it uses less digits than its factorization.

66450745636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136572 (or 136559 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 52.

The spelling of 66450745636 in words is "sixty-six billion, four hundred fifty million, seven hundred forty-five thousand, six hundred thirty-six".