81869341587 has 8 divisors (see below), whose sum is σ = 119082678720. Its totient is φ = 49617782760.

The previous prime is 81869341577. The next prime is 81869341601. The reversal of 81869341587 is 78514396818.

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

It is not a de Polignac number, because 81869341587 - 2⁷ = 81869341459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81869341587.

It is not an unprimeable number, because it can be changed into a prime (81869341577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1240444537 + ... + 1240444602.

It is an arithmetic number, because the mean of its divisors is an integer number (14885334840).

Almost surely, 2^81869341587 is an apocalyptic number.

81869341587 is a deficient number, since it is larger than the sum of its proper divisors (37213337133).

81869341587 is a wasteful number, since it uses less digits than its factorization.

81869341587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2480889153.

The product of its digits is 11612160, while the sum is 60.

The spelling of 81869341587 in words is "eighty-one billion, eight hundred sixty-nine million, three hundred forty-one thousand, five hundred eighty-seven".