81115145150 has 24 divisors (see below), whose sum is σ = 162479876664. Its totient is φ = 29950207200.

The previous prime is 81115145147. The next prime is 81115145179. The reversal of 81115145150 is 5154151118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62395616 + ... + 62396915.

It is an arithmetic number, because the mean of its divisors is an integer number (6769994861).

Almost surely, 2^81115145150 is an apocalyptic number.

81115145150 is an abundant number, since it is smaller than the sum of its proper divisors (81364731514).

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

81115145150 is a wasteful number, since it uses less digits than its factorization.

81115145150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124792556 (or 124792551 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 32.

Adding to 81115145150 its reverse (5154151118), we get a palindrome (86269296268).

The spelling of 81115145150 in words is "eighty-one billion, one hundred fifteen million, one hundred forty-five thousand, one hundred fifty".