66840575752 has 8 divisors (see below), whose sum is σ = 125326079550. Its totient is φ = 33420287872.

The previous prime is 66840575743. The next prime is 66840575773. The reversal of 66840575752 is 25757504866.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 54239615236 + 12600960516 = 232894^2 + 112254^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66840575693 and 66840575702.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4177535977 + ... + 4177535992.

Almost surely, 2^66840575752 is an apocalyptic number.

It is an amenable number.

66840575752 is a deficient number, since it is larger than the sum of its proper divisors (58485503798).

66840575752 is a wasteful number, since it uses less digits than its factorization.

66840575752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8355071975 (or 8355071971 counting only the distinct ones).

The product of its (nonzero) digits is 14112000, while the sum is 55.

The spelling of 66840575752 in words is "sixty-six billion, eight hundred forty million, five hundred seventy-five thousand, seven hundred fifty-two".