7778878166 has 8 divisors (see below), whose sum is σ = 11709548904. Its totient is φ = 3875695200.

The previous prime is 7778878157. The next prime is 7778878169. The reversal of 7778878166 is 6618788777.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7778878169) 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, 6871235 + ... + 6872366.

It is an arithmetic number, because the mean of its divisors is an integer number (1463693613).

Almost surely, 2^7778878166 is an apocalyptic number.

7778878166 is a deficient number, since it is larger than the sum of its proper divisors (3930670738).

7778878166 is a wasteful number, since it uses less digits than its factorization.

7778878166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13743886.

The product of its digits is 44255232, while the sum is 65.

The square root of 7778878166 is about 88197.9487629956. The cubic root of 7778878166 is about 1981.4007506346.

The spelling of 7778878166 in words is "seven billion, seven hundred seventy-eight million, eight hundred seventy-eight thousand, one hundred sixty-six".