81245936826936 has 128 divisors (see below), whose sum is σ = 257932074470400. Its totient is φ = 23212362913920.

The previous prime is 81245936826907. The next prime is 81245936826949. The reversal of 81245936826936 is 63962863954218.

81245936826936 is a `hidden beast` number, since 8 + 1 + 2 + 4 + 593 + 6 + 8 + 26 + 9 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46025341 + ... + 47757971.

It is an arithmetic number, because the mean of its divisors is an integer number (2015094331800).

Almost surely, 2^{81245936826936} is an apocalyptic number.

It is an amenable number.

81245936826936 is an abundant number, since it is smaller than the sum of its proper divisors (176686137643464).

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

81245936826936 is a wasteful number, since it uses less digits than its factorization.

81245936826936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1763666 (or 1763656 counting only the distinct ones).

The product of its digits is 806215680, while the sum is 72.

The spelling of 81245936826936 in words is "eighty-one trillion, two hundred forty-five billion, nine hundred thirty-six million, eight hundred twenty-six thousand, nine hundred thirty-six".