80861663 has 4 divisors (see below), whose sum is σ = 85117560. Its totient is φ = 76605768.

The previous prime is 80861659. The next prime is 80861681. The reversal of 80861663 is 36616808.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 80861663 - 2² = 80861659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80861603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2127920 + ... + 2127957.

It is an arithmetic number, because the mean of its divisors is an integer number (21279390).

Almost surely, 2^80861663 is an apocalyptic number.

80861663 is a deficient number, since it is larger than the sum of its proper divisors (4255897).

80861663 is a wasteful number, since it uses less digits than its factorization.

80861663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4255896.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 80861663 is about 8992.3113269059. The cubic root of 80861663 is about 432.4284140934.

The spelling of 80861663 in words is "eighty million, eight hundred sixty-one thousand, six hundred sixty-three".