81262574160 has 80 divisors (see below), whose sum is σ = 260040261120. Its totient is φ = 20970984960.

The previous prime is 81262574137. The next prime is 81262574171. The reversal of 81262574160 is 6147526218.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5453755 + ... + 5468634.

It is an arithmetic number, because the mean of its divisors is an integer number (3250503264).

Almost surely, 2^81262574160 is an apocalyptic number.

81262574160 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81262574160 is an abundant number, since it is smaller than the sum of its proper divisors (178777686960).

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

81262574160 is a wasteful number, since it uses less digits than its factorization.

81262574160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10922436 (or 10922430 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 81262574160 in words is "eighty-one billion, two hundred sixty-two million, five hundred seventy-four thousand, one hundred sixty".