81095424772 has 12 divisors (see below), whose sum is σ = 143511566940. Its totient is φ = 40092119936.

The previous prime is 81095424757. The next prime is 81095424797. The reversal of 81095424772 is 27742459018.

It can be written as a sum of positive squares in 2 ways, for example, as 43045460676 + 38049964096 = 207474^2 + 195064^2 .

It is a super-2 number, since 2×81095424772² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113897713 + ... + 113898424.

It is an arithmetic number, because the mean of its divisors is an integer number (11959297245).

Almost surely, 2^81095424772 is an apocalyptic number.

It is an amenable number.

81095424772 is a deficient number, since it is larger than the sum of its proper divisors (62416142168).

81095424772 is a wasteful number, since it uses less digits than its factorization.

81095424772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227796230 (or 227796228 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 81095424772 in words is "eighty-one billion, ninety-five million, four hundred twenty-four thousand, seven hundred seventy-two".