525540666 has 32 divisors (see below), whose sum is σ = 1212266880. Its totient is φ = 148775616.

The previous prime is 525540661. The next prime is 525540667. The reversal of 525540666 is 666045525.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (525540661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52821 + ... + 61976.

It is an arithmetic number, because the mean of its divisors is an integer number (37883340).

Almost surely, 2^525540666 is an apocalyptic number.

525540666 is an abundant number, since it is smaller than the sum of its proper divisors (686726214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

525540666 is a wasteful number, since it uses less digits than its factorization.

525540666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114918.

The product of its (nonzero) digits is 216000, while the sum is 39.

The square root of 525540666 is about 22924.6737381364. The cubic root of 525540666 is about 806.9911568953.

The spelling of 525540666 in words is "five hundred twenty-five million, five hundred forty thousand, six hundred sixty-six".