81588500077 has 8 divisors (see below), whose sum is σ = 98151579200. Its totient is φ = 66252315744.

The previous prime is 81588500053. The next prime is 81588500083. The reversal of 81588500077 is 77000588518.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81588500077 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 81588500077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81588500087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306723552 + ... + 306723817.

It is an arithmetic number, because the mean of its divisors is an integer number (12268947400).

Almost surely, 2^81588500077 is an apocalyptic number.

It is an amenable number.

81588500077 is a deficient number, since it is larger than the sum of its proper divisors (16563079123).

81588500077 is a wasteful number, since it uses less digits than its factorization.

81588500077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613447395.

The product of its (nonzero) digits is 627200, while the sum is 49.

The spelling of 81588500077 in words is "eighty-one billion, five hundred eighty-eight million, five hundred thousand, seventy-seven".