81258382100612 has 12 divisors (see below), whose sum is σ = 142205781903360. Its totient is φ = 40628158699656.

The previous prime is 81258382100611. The next prime is 81258382100663. The reversal of 81258382100612 is 21600128385218.

It is not an unprimeable number, because it can be changed into a prime (81258382100611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257910548 + ... + 258225419.

It is an arithmetic number, because the mean of its divisors is an integer number (11850481825280).

Almost surely, 2^{81258382100612} is an apocalyptic number.

It is an amenable number.

81258382100612 is a deficient number, since it is larger than the sum of its proper divisors (60947399802748).

81258382100612 is a wasteful number, since it uses less digits than its factorization.

81258382100612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516175330 (or 516175328 counting only the distinct ones).

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

The spelling of 81258382100612 in words is "eighty-one trillion, two hundred fifty-eight billion, three hundred eighty-two million, one hundred thousand, six hundred twelve".