66531464766736 has 40 divisors (see below), whose sum is σ = 130299541358360. Its totient is φ = 32906772412416.

The previous prime is 66531464766733. The next prime is 66531464766737. The reversal of 66531464766736 is 63766746413566.

It can be written as a sum of positive squares in 4 ways, for example, as 140583003136 + 66390881763600 = 374944^2 + 8148060^2 .

It is a super-4 number, since 4×66531464766736⁴ (a number of 56 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (66531464766733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30047385 + ... + 32185528.

It is an arithmetic number, because the mean of its divisors is an integer number (3257488533959).

Almost surely, 2^{66531464766736} is an apocalyptic number.

It is an amenable number.

66531464766736 is a deficient number, since it is larger than the sum of its proper divisors (63768076591624).

66531464766736 is a wasteful number, since it uses less digits than its factorization.

66531464766736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62233643 (or 62233637 counting only the distinct ones).

The product of its digits is 1646023680, while the sum is 70.

The spelling of 66531464766736 in words is "sixty-six trillion, five hundred thirty-one billion, four hundred sixty-four million, seven hundred sixty-six thousand, seven hundred thirty-six".