66736740667040 has 48 divisors (see below), whose sum is σ = 158816393307432. Its totient is φ = 26499844460544.

The previous prime is 66736740667027. The next prime is 66736740667049. The reversal of 66736740667040 is 4076604763766.

It is a happy number.

66736740667040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 45160604186896 + 21576136480144 = 6720164^2 + 4645012^2 .

It is not an unprimeable number, because it can be changed into a prime (66736740667049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1522257749 + ... + 1522301588.

Almost surely, 2^{66736740667040} is an apocalyptic number.

It is an amenable number.

66736740667040 is an abundant number, since it is smaller than the sum of its proper divisors (92079652640392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66736740667040 is a wasteful number, since it uses less digits than its factorization.

66736740667040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044559489 (or 3044559481 counting only the distinct ones).

The product of its (nonzero) digits is 128024064, while the sum is 62.

The spelling of 66736740667040 in words is "sixty-six trillion, seven hundred thirty-six billion, seven hundred forty million, six hundred sixty-seven thousand, forty".