7666163638 has 16 divisors (see below), whose sum is σ = 13152268800. Its totient is φ = 3282930216.

The previous prime is 7666163629. The next prime is 7666163653. The reversal of 7666163638 is 8363616667.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195438 + ... + 231361.

It is an arithmetic number, because the mean of its divisors is an integer number (822016800).

Almost surely, 2^7666163638 is an apocalyptic number.

7666163638 is a deficient number, since it is larger than the sum of its proper divisors (5486105162).

7666163638 is a wasteful number, since it uses less digits than its factorization.

7666163638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428091.

The product of its digits is 3919104, while the sum is 52.

The square root of 7666163638 is about 87556.6310338629. The cubic root of 7666163638 is about 1971.7841068284.

The spelling of 7666163638 in words is "seven billion, six hundred sixty-six million, one hundred sixty-three thousand, six hundred thirty-eight".