81236101776 has 160 divisors (see below), whose sum is σ = 229400734080. Its totient is φ = 24684134400.

The previous prime is 81236101763. The next prime is 81236101789. The reversal of 81236101776 is 67710163218.

It is an interprime number because it is at equal distance from previous prime (81236101763) and next prime (81236101789).

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, 2714736 + ... + 2744496.

It is an arithmetic number, because the mean of its divisors is an integer number (1433754588).

Almost surely, 2^81236101776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81236101776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114700367040).

81236101776 is an abundant number, since it is smaller than the sum of its proper divisors (148164632304).

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

81236101776 is a wasteful number, since it uses less digits than its factorization.

81236101776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29905 (or 29899 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The spelling of 81236101776 in words is "eighty-one billion, two hundred thirty-six million, one hundred one thousand, seven hundred seventy-six".