78166079 has 2 divisors, whose sum is σ = 78166080. Its totient is φ = 78166078.

The previous prime is 78166073. The next prime is 78166093. The reversal of 78166079 is 97066187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78166079 - 2⁴ = 78166063 is a prime.

It is a super-2 number, since 2×78166079² = 12219871812468482, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78166073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39083039 + 39083040.

It is an arithmetic number, because the mean of its divisors is an integer number (39083040).

Almost surely, 2^78166079 is an apocalyptic number.

78166079 is a deficient number, since it is larger than the sum of its proper divisors (1).

78166079 is an equidigital number, since it uses as much as digits as its factorization.

78166079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 78166079 is about 8841.1582386020. The cubic root of 78166079 is about 427.5689005826.

The spelling of 78166079 in words is "seventy-eight million, one hundred sixty-six thousand, seventy-nine".