66571067525 has 6 divisors (see below), whose sum is σ = 82548123762. Its totient is φ = 53256854000.

The previous prime is 66571067503. The next prime is 66571067527. The reversal of 66571067525 is 52576017566.

It can be written as a sum of positive squares in 3 ways, for example, as 17861253316 + 48709814209 = 133646^2 + 220703^2 .

It is not a de Polignac number, because 66571067525 - 2⁶ = 66571067461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66571067527) 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, 1331421326 + ... + 1331421375.

It is an arithmetic number, because the mean of its divisors is an integer number (13758020627).

Almost surely, 2^66571067525 is an apocalyptic number.

It is an amenable number.

66571067525 is a deficient number, since it is larger than the sum of its proper divisors (15977056237).

66571067525 is a wasteful number, since it uses less digits than its factorization.

66571067525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662842711 (or 2662842706 counting only the distinct ones).

The product of its (nonzero) digits is 2646000, while the sum is 50.

The spelling of 66571067525 in words is "sixty-six billion, five hundred seventy-one million, sixty-seven thousand, five hundred twenty-five".