7525666 has 4 divisors (see below), whose sum is σ = 11288502. Its totient is φ = 3762832.

The previous prime is 7525657. The next prime is 7525709. The reversal of 7525666 is 6665257.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6665257 = 19 ⋅350803.

It can be written as a sum of positive squares in only one way, i.e., 5900041 + 1625625 = 2429^2 + 1275^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1881415 + ... + 1881418.

Almost surely, 2^7525666 is an apocalyptic number.

7525666 is a deficient number, since it is larger than the sum of its proper divisors (3762836).

7525666 is a wasteful number, since it uses less digits than its factorization.

7525666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3762835.

The product of its digits is 75600, while the sum is 37.

The square root of 7525666 is about 2743.2947344389. The cubic root of 7525666 is about 195.9664144869.

The spelling of 7525666 in words is "seven million, five hundred twenty-five thousand, six hundred sixty-six".