81111287610 has 48 divisors (see below), whose sum is σ = 210916667520. Its totient is φ = 21626874720.

The previous prime is 81111287573. The next prime is 81111287623. The reversal of 81111287610 is 1678211118.

81111287610 is a `hidden beast` number, since 8 + 1 + 1 + 11 + 28 + 7 + 610 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 693771 + ... + 802209.

It is an arithmetic number, because the mean of its divisors is an integer number (4394097240).

Almost surely, 2^81111287610 is an apocalyptic number.

81111287610 is an abundant number, since it is smaller than the sum of its proper divisors (129805379910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81111287610 is a wasteful number, since it uses less digits than its factorization.

81111287610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116763 (or 116760 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 36.

Adding to 81111287610 its reverse (1678211118), we get a palindrome (82789498728).

The spelling of 81111287610 in words is "eighty-one billion, one hundred eleven million, two hundred eighty-seven thousand, six hundred ten".