66031552064 has 14 divisors (see below), whose sum is σ = 131031361254. Its totient is φ = 33015776000.

The previous prime is 66031551977. The next prime is 66031552109. The reversal of 66031552064 is 46025513066.

It is a happy number.

66031552064 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 only one way, i.e., 62620057600 + 3411494464 = 250240^2 + 58408^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515871437 + ... + 515871564.

Almost surely, 2^66031552064 is an apocalyptic number.

66031552064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66031552064 is a deficient number, since it is larger than the sum of its proper divisors (64999809190).

66031552064 is a wasteful number, since it uses less digits than its factorization.

66031552064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031743013 (or 1031743003 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 66031552064 in words is "sixty-six billion, thirty-one million, five hundred fifty-two thousand, sixty-four".