66505131610 has 8 divisors (see below), whose sum is σ = 119709236916. Its totient is φ = 26602052640.

The previous prime is 66505131587. The next prime is 66505131613. The reversal of 66505131610 is 1613150566.

It can be written as a sum of positive squares in 2 ways, for example, as 66333547809 + 171583801 = 257553^2 + 13099^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66505131613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3325256571 + ... + 3325256590.

Almost surely, 2^66505131610 is an apocalyptic number.

66505131610 is a deficient number, since it is larger than the sum of its proper divisors (53204105306).

66505131610 is a wasteful number, since it uses less digits than its factorization.

66505131610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6650513168.

The product of its (nonzero) digits is 16200, while the sum is 34.

The spelling of 66505131610 in words is "sixty-six billion, five hundred five million, one hundred thirty-one thousand, six hundred ten".