81641588590 has 8 divisors (see below), whose sum is σ = 146954859480. Its totient is φ = 32656635432.

The previous prime is 81641588573. The next prime is 81641588593. The reversal of 81641588590 is 9588514618.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81641588593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4082079420 + ... + 4082079439.

It is an arithmetic number, because the mean of its divisors is an integer number (18369357435).

Almost surely, 2^81641588590 is an apocalyptic number.

81641588590 is a deficient number, since it is larger than the sum of its proper divisors (65313270890).

81641588590 is a wasteful number, since it uses less digits than its factorization.

81641588590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8164158866.

The product of its (nonzero) digits is 2764800, while the sum is 55.

The spelling of 81641588590 in words is "eighty-one billion, six hundred forty-one million, five hundred eighty-eight thousand, five hundred ninety".