81280811358 has 12 divisors (see below), whose sum is σ = 176108424648. Its totient is φ = 27093603780.

The previous prime is 81280811323. The next prime is 81280811363. The reversal of 81280811358 is 85311808218.

81280811358 is a `hidden beast` number, since 8 + 1 + 280 + 8 + 11 + 358 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2257800298 + ... + 2257800333.

It is an arithmetic number, because the mean of its divisors is an integer number (14675702054).

Almost surely, 2^81280811358 is an apocalyptic number.

81280811358 is an abundant number, since it is smaller than the sum of its proper divisors (94827613290).

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

81280811358 is a wasteful number, since it uses less digits than its factorization.

81280811358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4515600639 (or 4515600636 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 45.

The spelling of 81280811358 in words is "eighty-one billion, two hundred eighty million, eight hundred eleven thousand, three hundred fifty-eight".