81125482506 has 16 divisors (see below), whose sum is σ = 162836711904. Its totient is φ = 26944203024.

The previous prime is 81125482489. The next prime is 81125482531. The reversal of 81125482506 is 60528452118.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24404320 + ... + 24407643.

It is an arithmetic number, because the mean of its divisors is an integer number (10177294494).

Almost surely, 2^81125482506 is an apocalyptic number.

81125482506 is an abundant number, since it is smaller than the sum of its proper divisors (81711229398).

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

81125482506 is a wasteful number, since it uses less digits than its factorization.

81125482506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48812245.

The product of its (nonzero) digits is 153600, while the sum is 42.

The spelling of 81125482506 in words is "eighty-one billion, one hundred twenty-five million, four hundred eighty-two thousand, five hundred six".