81975949830480 has 160 divisors (see below), whose sum is σ = 266160160016640. Its totient is φ = 20832075489280.

The previous prime is 81975949830469. The next prime is 81975949830539. The reversal of 81975949830480 is 8403894957918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26118681 + ... + 29088440.

It is an arithmetic number, because the mean of its divisors is an integer number (1663501000104).

Almost surely, 2^{81975949830480} is an apocalyptic number.

81975949830480 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81975949830480 is an abundant number, since it is smaller than the sum of its proper divisors (184184210186160).

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

81975949830480 is a wasteful number, since it uses less digits than its factorization.

81975949830480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55207429 (or 55207423 counting only the distinct ones).

The product of its (nonzero) digits is 627056640, while the sum is 75.

The spelling of 81975949830480 in words is "eighty-one trillion, nine hundred seventy-five billion, nine hundred forty-nine million, eight hundred thirty thousand, four hundred eighty".