81001000011 has 8 divisors (see below), whose sum is σ = 108085780480. Its totient is φ = 53958443112.

The previous prime is 81000999977. The next prime is 81001000037. The reversal of 81001000011 is 11000010018.

It is a happy number.

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

It is not a de Polignac number, because 81001000011 - 2¹¹ = 81000997963 is a prime.

It is a super-2 number, since 2×81001000011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81001000081) 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, 10551415 + ... + 10559088.

It is an arithmetic number, because the mean of its divisors is an integer number (13510722560).

Almost surely, 2^81001000011 is an apocalyptic number.

81001000011 is a deficient number, since it is larger than the sum of its proper divisors (27084780469).

81001000011 is a wasteful number, since it uses less digits than its factorization.

81001000011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21111785.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 81001000011 its reverse (11000010018), we get a palindrome (92001010029).

The spelling of 81001000011 in words is "eighty-one billion, one million, eleven", and thus it is an aban number and an uban number.