7551666 has 12 divisors (see below), whose sum is σ = 16361982. Its totient is φ = 2517216.

The previous prime is 7551653. The next prime is 7551671. The reversal of 7551666 is 6661557.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7535025 + 16641 = 2745^2 + 129^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 7551666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 209751 + ... + 209786.

Almost surely, 2^7551666 is an apocalyptic number.

7551666 is an abundant number, since it is smaller than the sum of its proper divisors (8810316).

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

7551666 is a wasteful number, since it uses less digits than its factorization.

7551666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419545 (or 419542 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 7551666 is about 2748.0294758244. The cubic root of 7551666 is about 196.1918328702.

The spelling of 7551666 in words is "seven million, five hundred fifty-one thousand, six hundred sixty-six".