66171905152 has 16 divisors (see below), whose sum is σ = 131826842550. Its totient is φ = 33085952512.

The previous prime is 66171905117. The next prime is 66171905161. The reversal of 66171905152 is 25150917166.

It can be written as a sum of positive squares in only one way, i.e., 56541230656 + 9630674496 = 237784^2 + 98136^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 66171905099 and 66171905108.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258483877 + ... + 258484132.

Almost surely, 2^66171905152 is an apocalyptic number.

It is an amenable number.

66171905152 is a deficient number, since it is larger than the sum of its proper divisors (65654937398).

66171905152 is an equidigital number, since it uses as much as digits as its factorization.

66171905152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516968023 (or 516968011 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 43.

The spelling of 66171905152 in words is "sixty-six billion, one hundred seventy-one million, nine hundred five thousand, one hundred fifty-two".