79818155 has 4 divisors (see below), whose sum is σ = 95781792. Its totient is φ = 63854520.

The previous prime is 79818131. The next prime is 79818157. The reversal of 79818155 is 55181897.

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 79818155 - 2¹⁰ = 79817131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79818157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7981811 + ... + 7981820.

It is an arithmetic number, because the mean of its divisors is an integer number (23945448).

Almost surely, 2^79818155 is an apocalyptic number.

79818155 is a deficient number, since it is larger than the sum of its proper divisors (15963637).

79818155 is a wasteful number, since it uses less digits than its factorization.

79818155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15963636.

The product of its digits is 100800, while the sum is 44.

The square root of 79818155 is about 8934.1006822175. The cubic root of 79818155 is about 430.5602126787.

The spelling of 79818155 in words is "seventy-nine million, eight hundred eighteen thousand, one hundred fifty-five".