66535725 has 12 divisors (see below), whose sum is σ = 110005856. Its totient is φ = 35485680.

The previous prime is 66535687. The next prime is 66535769. The reversal of 66535725 is 52753566.

It is not a de Polignac number, because 66535725 - 2¹³ = 66527533 is a prime.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

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, 443497 + ... + 443646.

Almost surely, 2^66535725 is an apocalyptic number.

It is an amenable number.

66535725 is a deficient number, since it is larger than the sum of its proper divisors (43470131).

66535725 is a wasteful number, since it uses less digits than its factorization.

66535725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887156 (or 887151 counting only the distinct ones).

The product of its digits is 189000, while the sum is 39.

The square root of 66535725 is about 8156.9433613333. The cubic root of 66535725 is about 405.2144878200.

The spelling of 66535725 in words is "sixty-six million, five hundred thirty-five thousand, seven hundred twenty-five".