80178779 has 2 divisors, whose sum is σ = 80178780. Its totient is φ = 80178778.

The previous prime is 80178767. The next prime is 80178781. The reversal of 80178779 is 97787108.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80178779 - 2¹² = 80174683 is a prime.

Together with 80178781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80178799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40089389 + 40089390.

It is an arithmetic number, because the mean of its divisors is an integer number (40089390).

Almost surely, 2^80178779 is an apocalyptic number.

80178779 is a deficient number, since it is larger than the sum of its proper divisors (1).

80178779 is an equidigital number, since it uses as much as digits as its factorization.

80178779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 47.

The square root of 80178779 is about 8954.2603826335. The cubic root of 80178779 is about 431.2076722721.

The spelling of 80178779 in words is "eighty million, one hundred seventy-eight thousand, seven hundred seventy-nine".