81962154872 has 16 divisors (see below), whose sum is σ = 165500505240. Its totient is φ = 37828686816.

The previous prime is 81962154871. The next prime is 81962154877. The reversal of 81962154872 is 27845126918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81962154871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394048718 + ... + 394048925.

Almost surely, 2^81962154872 is an apocalyptic number.

It is an amenable number.

81962154872 is an abundant number, since it is smaller than the sum of its proper divisors (83538350368).

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

81962154872 is a wasteful number, since it uses less digits than its factorization.

81962154872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788097662 (or 788097658 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 53.

The spelling of 81962154872 in words is "eighty-one billion, nine hundred sixty-two million, one hundred fifty-four thousand, eight hundred seventy-two".