81630205448 has 16 divisors (see below), whose sum is σ = 166970874960. Its totient is φ = 37104638800.

The previous prime is 81630205439. The next prime is 81630205451. The reversal of 81630205448 is 84450203618.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463807898 + ... + 463808073.

It is an arithmetic number, because the mean of its divisors is an integer number (10435679685).

Almost surely, 2^81630205448 is an apocalyptic number.

81630205448 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

81630205448 is an abundant number, since it is smaller than the sum of its proper divisors (85340669512).

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

81630205448 is a wasteful number, since it uses less digits than its factorization.

81630205448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927615988 (or 927615984 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 41.

The spelling of 81630205448 in words is "eighty-one billion, six hundred thirty million, two hundred five thousand, four hundred forty-eight".