66531908241 has 6 divisors (see below), whose sum is σ = 96101645250. Its totient is φ = 44354605488.

The previous prime is 66531908231. The next prime is 66531908243. The reversal of 66531908241 is 14280913566.

66531908241 is a `hidden beast` number, since 6 + 6 + 531 + 90 + 8 + 24 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 50146884225 + 16385024016 = 223935^2 + 128004^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66531908241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66531908243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3696217116 + ... + 3696217133.

It is an arithmetic number, because the mean of its divisors is an integer number (16016940875).

Almost surely, 2^66531908241 is an apocalyptic number.

It is an amenable number.

66531908241 is a deficient number, since it is larger than the sum of its proper divisors (29569737009).

66531908241 is a wasteful number, since it uses less digits than its factorization.

66531908241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7392434255 (or 7392434252 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 66531908241 in words is "sixty-six billion, five hundred thirty-one million, nine hundred eight thousand, two hundred forty-one".