80776643 has 2 divisors, whose sum is σ = 80776644. Its totient is φ = 80776642.

The previous prime is 80776609. The next prime is 80776721. The reversal of 80776643 is 34667708.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80776643 - 2⁸ = 80776387 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80776643.

It is not a weakly prime, because it can be changed into another prime (80776603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40388321 + 40388322.

It is an arithmetic number, because the mean of its divisors is an integer number (40388322).

Almost surely, 2^80776643 is an apocalyptic number.

80776643 is a deficient number, since it is larger than the sum of its proper divisors (1).

80776643 is an equidigital number, since it uses as much as digits as its factorization.

80776643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 41.

The square root of 80776643 is about 8987.5827117195. The cubic root of 80776643 is about 432.2768055512.

The spelling of 80776643 in words is "eighty million, seven hundred seventy-six thousand, six hundred forty-three".