81008454980 has 12 divisors (see below), whose sum is σ = 170117755500. Its totient is φ = 32403381984.

The previous prime is 81008454959. The next prime is 81008454991. The reversal of 81008454980 is 8945480018.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 54650283076 + 26358171904 = 233774^2 + 162352^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2025211355 + ... + 2025211394.

It is an arithmetic number, because the mean of its divisors is an integer number (14176479625).

Almost surely, 2^81008454980 is an apocalyptic number.

It is an amenable number.

81008454980 is an abundant number, since it is smaller than the sum of its proper divisors (89109300520).

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

81008454980 is a wasteful number, since it uses less digits than its factorization.

81008454980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4050422758 (or 4050422756 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 47.

The spelling of 81008454980 in words is "eighty-one billion, eight million, four hundred fifty-four thousand, nine hundred eighty".