80780002505 has 8 divisors (see below), whose sum is σ = 97895766024. Its totient is φ = 63984160000.

The previous prime is 80780002489. The next prime is 80780002517. The reversal of 80780002505 is 50520008708.

It can be written as a sum of positive squares in 4 ways, for example, as 9525174409 + 71254828096 = 97597^2 + 266936^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 80780002505 - 2⁴ = 80780002489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79979696 + ... + 79980705.

It is an arithmetic number, because the mean of its divisors is an integer number (12236970753).

Almost surely, 2^80780002505 is an apocalyptic number.

It is an amenable number.

80780002505 is a deficient number, since it is larger than the sum of its proper divisors (17115763519).

80780002505 is a wasteful number, since it uses less digits than its factorization.

80780002505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159960507.

The product of its (nonzero) digits is 22400, while the sum is 35.

The spelling of 80780002505 in words is "eighty billion, seven hundred eighty million, two thousand, five hundred five".