79666555 has 4 divisors (see below), whose sum is σ = 95599872. Its totient is φ = 63733240.

The previous prime is 79666553. The next prime is 79666577. The reversal of 79666555 is 55566697.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 79666555 - 2¹ = 79666553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79666499 and 79666508.

It is not an unprimeable number, because it can be changed into a prime (79666553) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7966651 + ... + 7966660.

It is an arithmetic number, because the mean of its divisors is an integer number (23899968).

Almost surely, 2^79666555 is an apocalyptic number.

79666555 is a deficient number, since it is larger than the sum of its proper divisors (15933317).

79666555 is a wasteful number, since it uses less digits than its factorization.

79666555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15933316.

The product of its digits is 1701000, while the sum is 49.

The square root of 79666555 is about 8925.6123039263. The cubic root of 79666555 is about 430.2874497691.

The spelling of 79666555 in words is "seventy-nine million, six hundred sixty-six thousand, five hundred fifty-five".