81956927452 has 6 divisors (see below), whose sum is σ = 143424623048. Its totient is φ = 40978463724.

The previous prime is 81956927401. The next prime is 81956927467. The reversal of 81956927452 is 25472965918.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10244615928 + ... + 10244615935.

Almost surely, 2^81956927452 is an apocalyptic number.

It is an amenable number.

81956927452 is a deficient number, since it is larger than the sum of its proper divisors (61467695596).

81956927452 is a wasteful number, since it uses less digits than its factorization.

81956927452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20489231867 (or 20489231865 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 58.

The spelling of 81956927452 in words is "eighty-one billion, nine hundred fifty-six million, nine hundred twenty-seven thousand, four hundred fifty-two".