80016779 has 2 divisors, whose sum is σ = 80016780. Its totient is φ = 80016778.

The previous prime is 80016767. The next prime is 80016799. The reversal of 80016779 is 97761008.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80016779 - 2¹² = 80012683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80016719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40008389 + 40008390.

It is an arithmetic number, because the mean of its divisors is an integer number (40008390).

Almost surely, 2^80016779 is an apocalyptic number.

80016779 is a deficient number, since it is larger than the sum of its proper divisors (1).

80016779 is an equidigital number, since it uses as much as digits as its factorization.

80016779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 80016779 is about 8945.2098354371. The cubic root of 80016779 is about 430.9170602836.

The spelling of 80016779 in words is "eighty million, sixteen thousand, seven hundred seventy-nine".