80445557 has 4 divisors (see below), whose sum is σ = 80466156. Its totient is φ = 80424960.

The previous prime is 80445517. The next prime is 80445593. The reversal of 80445557 is 75554408.

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

It can be written as a sum of positive squares in 2 ways, for example, as 65383396 + 15062161 = 8086^2 + 3881^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80445557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80445557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80445517) 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, 2444 + ... + 12917.

It is an arithmetic number, because the mean of its divisors is an integer number (20116539).

Almost surely, 2^80445557 is an apocalyptic number.

It is an amenable number.

80445557 is a deficient number, since it is larger than the sum of its proper divisors (20599).

80445557 is a wasteful number, since it uses less digits than its factorization.

80445557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20598.

The product of its (nonzero) digits is 112000, while the sum is 38.

The square root of 80445557 is about 8969.1447195371. The cubic root of 80445557 is about 431.6853937272.

The spelling of 80445557 in words is "eighty million, four hundred forty-five thousand, five hundred fifty-seven".