80649643 has 2 divisors, whose sum is σ = 80649644. Its totient is φ = 80649642.

The previous prime is 80649641. The next prime is 80649671. The reversal of 80649643 is 34694608.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80649643 - 2¹ = 80649641 is a prime.

Together with 80649641, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 80649596 and 80649605.

It is not a weakly prime, because it can be changed into another prime (80649641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40324821 + 40324822.

It is an arithmetic number, because the mean of its divisors is an integer number (40324822).

Almost surely, 2^80649643 is an apocalyptic number.

80649643 is a deficient number, since it is larger than the sum of its proper divisors (1).

80649643 is an equidigital number, since it uses as much as digits as its factorization.

80649643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 80649643 is about 8980.5146289063. The cubic root of 80649643 is about 432.0501395708.

The spelling of 80649643 in words is "eighty million, six hundred forty-nine thousand, six hundred forty-three".