81282577615 has 32 divisors (see below), whose sum is σ = 105534938880. Its totient is φ = 59864285184.

The previous prime is 81282577601. The next prime is 81282577631. The reversal of 81282577615 is 51677528218.

It is a cyclic number.

It is not a de Polignac number, because 81282577615 - 2⁷ = 81282577487 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8436621 + ... + 8446249.

It is an arithmetic number, because the mean of its divisors is an integer number (3297966840).

Almost surely, 2^81282577615 is an apocalyptic number.

81282577615 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81282577615 is a deficient number, since it is larger than the sum of its proper divisors (24252361265).

81282577615 is a wasteful number, since it uses less digits than its factorization.

81282577615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11811.

The product of its digits is 1881600, while the sum is 52.

The spelling of 81282577615 in words is "eighty-one billion, two hundred eighty-two million, five hundred seventy-seven thousand, six hundred fifteen".