66571787925 has 192 divisors, whose sum is σ = 133168262400. Its totient is φ = 32886881280.

The previous prime is 66571787921. The next prime is 66571787941. The reversal of 66571787925 is 52978717566.

It is not a de Polignac number, because 66571787925 - 2² = 66571787921 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66571787921) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 62274291 + ... + 62275359.

It is an arithmetic number, because the mean of its divisors is an integer number (693584700).

Almost surely, 2^66571787925 is an apocalyptic number.

It is an amenable number.

66571787925 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

66571787925 is a wasteful number, since it uses less digits than its factorization.

66571787925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184 (or 1161 counting only the distinct ones).

The product of its digits is 44452800, while the sum is 63.

The spelling of 66571787925 in words is "sixty-six billion, five hundred seventy-one million, seven hundred eighty-seven thousand, nine hundred twenty-five".