81347158106 has 32 divisors (see below), whose sum is σ = 131234688000. Its totient is φ = 37696061232.

The previous prime is 81347158097. The next prime is 81347158121. The reversal of 81347158106 is 60185174318.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4525685 + ... + 4543623.

It is an arithmetic number, because the mean of its divisors is an integer number (4101084000).

Almost surely, 2^81347158106 is an apocalyptic number.

81347158106 is a deficient number, since it is larger than the sum of its proper divisors (49887529894).

81347158106 is a wasteful number, since it uses less digits than its factorization.

81347158106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20546.

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 81347158106 in words is "eighty-one billion, three hundred forty-seven million, one hundred fifty-eight thousand, one hundred six".