80618861 has 2 divisors, whose sum is σ = 80618862. Its totient is φ = 80618860.

The previous prime is 80618827. The next prime is 80618891. The reversal of 80618861 is 16881608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51566761 + 29052100 = 7181^2 + 5390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80618861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80618801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40309430 + 40309431.

It is an arithmetic number, because the mean of its divisors is an integer number (40309431).

Almost surely, 2^80618861 is an apocalyptic number.

It is an amenable number.

80618861 is a deficient number, since it is larger than the sum of its proper divisors (1).

80618861 is an equidigital number, since it uses as much as digits as its factorization.

80618861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 80618861 is about 8978.8006437386. The cubic root of 80618861 is about 431.9951649122.

The spelling of 80618861 in words is "eighty million, six hundred eighteen thousand, eight hundred sixty-one".