81577580059 has 4 divisors (see below), whose sum is σ = 82004688000. Its totient is φ = 81150472120.

The previous prime is 81577580011. The next prime is 81577580083. The reversal of 81577580059 is 95008577518.

It is a happy number.

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 81577580059 - 2⁷ = 81577579931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81577579991 and 81577580009.

It is not an unprimeable number, because it can be changed into a prime (81577550059) 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, 213553684 + ... + 213554065.

It is an arithmetic number, because the mean of its divisors is an integer number (20501172000).

Almost surely, 2^81577580059 is an apocalyptic number.

81577580059 is a deficient number, since it is larger than the sum of its proper divisors (427107941).

81577580059 is a wasteful number, since it uses less digits than its factorization.

81577580059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427107940.

The product of its (nonzero) digits is 3528000, while the sum is 55.

The spelling of 81577580059 in words is "eighty-one billion, five hundred seventy-seven million, five hundred eighty thousand, fifty-nine".