81159640702152 has 64 divisors (see below), whose sum is σ = 202994740224000. Its totient is φ = 27040463039040.

The previous prime is 81159640702103. The next prime is 81159640702171. The reversal of 81159640702152 is 25120704695118.

It is a super-2 number, since 2×81159640702152² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81159640702095 and 81159640702104.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1744932577 + ... + 1744979087.

It is an arithmetic number, because the mean of its divisors is an integer number (3171792816000).

Almost surely, 2^{81159640702152} is an apocalyptic number.

It is an amenable number.

81159640702152 is an abundant number, since it is smaller than the sum of its proper divisors (121835099521848).

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

81159640702152 is a wasteful number, since it uses less digits than its factorization.

81159640702152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79226 (or 79222 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 51.

The spelling of 81159640702152 in words is "eighty-one trillion, one hundred fifty-nine billion, six hundred forty million, seven hundred two thousand, one hundred fifty-two".