81952012555 has 8 divisors (see below), whose sum is σ = 112391331552. Its totient is φ = 56195665728.

The previous prime is 81952012531. The next prime is 81952012567. The reversal of 81952012555 is 55521025918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81952012555 - 2³¹ = 79804528907 is a prime.

It is a super-2 number, since 2×81952012555² (a number of 23 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 1170743002 + ... + 1170743071.

It is an arithmetic number, because the mean of its divisors is an integer number (14048916444).

Almost surely, 2^81952012555 is an apocalyptic number.

81952012555 is a deficient number, since it is larger than the sum of its proper divisors (30439318997).

81952012555 is a wasteful number, since it uses less digits than its factorization.

81952012555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2341486085.

The product of its (nonzero) digits is 180000, while the sum is 43.

The spelling of 81952012555 in words is "eighty-one billion, nine hundred fifty-two million, twelve thousand, five hundred fifty-five".