78116665 has 8 divisors (see below), whose sum is σ = 102261888. Its totient is φ = 56812080.

The previous prime is 78116663. The next prime is 78116693. The reversal of 78116665 is 56661187.

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

It is not a de Polignac number, because 78116665 - 2¹ = 78116663 is a prime.

It is a super-2 number, since 2×78116665² = 12204426701444450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78116663) 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 7 ways as a sum of consecutive naturals, for example, 710097 + ... + 710206.

It is an arithmetic number, because the mean of its divisors is an integer number (12782736).

Almost surely, 2^78116665 is an apocalyptic number.

It is an amenable number.

78116665 is a deficient number, since it is larger than the sum of its proper divisors (24145223).

78116665 is a wasteful number, since it uses less digits than its factorization.

78116665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420319.

The product of its digits is 60480, while the sum is 40.

The square root of 78116665 is about 8838.3632534537. The cubic root of 78116665 is about 427.4787833023.

The spelling of 78116665 in words is "seventy-eight million, one hundred sixteen thousand, six hundred sixty-five".