81496207086 has 128 divisors (see below), whose sum is σ = 194516090880. Its totient is φ = 22273574400.

The previous prime is 81496207049. The next prime is 81496207087. The reversal of 81496207086 is 68070269418.

It is a super-2 number, since 2×81496207086² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81496207087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 54731430 + ... + 54732918.

It is an arithmetic number, because the mean of its divisors is an integer number (1519656960).

Almost surely, 2^81496207086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81496207086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97258045440).

81496207086 is an abundant number, since it is smaller than the sum of its proper divisors (113019883794).

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

81496207086 is a wasteful number, since it uses less digits than its factorization.

81496207086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990.

The product of its (nonzero) digits is 1161216, while the sum is 51.

The spelling of 81496207086 in words is "eighty-one billion, four hundred ninety-six million, two hundred seven thousand, eighty-six".