7666663 has 4 divisors (see below), whose sum is σ = 7792408. Its totient is φ = 7540920.

The previous prime is 7666661. The next prime is 7666667. The reversal of 7666663 is 3666667.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3666667 = 829 ⋅4423.

It is a cyclic number.

It is not a de Polignac number, because 7666663 - 2¹ = 7666661 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7666661) 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 3 ways as a sum of consecutive naturals, for example, 62781 + ... + 62902.

It is an arithmetic number, because the mean of its divisors is an integer number (1948102).

Almost surely, 2^7666663 is an apocalyptic number.

7666663 is a deficient number, since it is larger than the sum of its proper divisors (125745).

7666663 is a wasteful number, since it uses less digits than its factorization.

7666663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125744.

The product of its digits is 163296, while the sum is 40.

The square root of 7666663 is about 2768.8739588504. The cubic root of 7666663 is about 197.1826918884.

It can be divided in two parts, 76666 and 63, that added together give a square (76729 = 277²).

The spelling of 7666663 in words is "seven million, six hundred sixty-six thousand, six hundred sixty-three".