81870001952 has 18 divisors (see below), whose sum is σ = 161184753009. Its totient is φ = 40934191680.

The previous prime is 81870001943. The next prime is 81870001991. The reversal of 81870001952 is 25910007818.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 78958752016 + 2911249936 = 280996^2 + 53956^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=202324.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1593302 + ... + 1643882.

Almost surely, 2^81870001952 is an apocalyptic number.

It is an amenable number.

81870001952 is a deficient number, since it is larger than the sum of its proper divisors (79314751057).

81870001952 is an frugal number, since it uses more digits than its factorization.

81870001952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101172 (or 50583 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 41.

The spelling of 81870001952 in words is "eighty-one billion, eight hundred seventy million, one thousand, nine hundred fifty-two".