80655909 has 4 divisors (see below), whose sum is σ = 107541216. Its totient is φ = 53770604.

The previous prime is 80655907. The next prime is 80655947. The reversal of 80655909 is 90955608.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80655909 - 2¹ = 80655907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80655907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13442649 + ... + 13442654.

It is an arithmetic number, because the mean of its divisors is an integer number (26885304).

Almost surely, 2^80655909 is an apocalyptic number.

It is an amenable number.

80655909 is a deficient number, since it is larger than the sum of its proper divisors (26885307).

80655909 is a wasteful number, since it uses less digits than its factorization.

80655909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26885306.

The product of its (nonzero) digits is 97200, while the sum is 42.

The square root of 80655909 is about 8980.8634885516. The cubic root of 80655909 is about 432.0613285274.

The spelling of 80655909 in words is "eighty million, six hundred fifty-five thousand, nine hundred nine".