66040525 has 12 divisors (see below), whose sum is σ = 82444500. Its totient is φ = 52474880.

The previous prime is 66040517. The next prime is 66040531. The reversal of 66040525 is 52504066.

It can be written as a sum of positive squares in 6 ways, for example, as 4778596 + 61261929 = 2186^2 + 7827^2 .

It is not a de Polignac number, because 66040525 - 2³ = 66040517 is a prime.

It is a super-2 number, since 2×66040525² = 8722701884551250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66040493 and 66040502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5140 + ... + 12589.

It is an arithmetic number, because the mean of its divisors is an integer number (6870375).

Almost surely, 2^66040525 is an apocalyptic number.

It is an amenable number.

66040525 is a deficient number, since it is larger than the sum of its proper divisors (16403975).

66040525 is a wasteful number, since it uses less digits than its factorization.

66040525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17888 (or 17883 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 66040525 is about 8126.5321632293. The cubic root of 66040525 is about 404.2066978925.

The spelling of 66040525 in words is "sixty-six million, forty thousand, five hundred twenty-five".