81206396352 has 42 divisors (see below), whose sum is σ = 232763474528. Its totient is φ = 27068798592.

The previous prime is 81206396317. The next prime is 81206396371. The reversal of 81206396352 is 25369360218.

81206396352 is a `hidden beast` number, since 8 + 1 + 2 + 0 + 6 + 3 + 9 + 635 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 81206396298 and 81206396307.

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, 70491088 + ... + 70492239.

Almost surely, 2^81206396352 is an apocalyptic number.

It is an amenable number.

81206396352 is an abundant number, since it is smaller than the sum of its proper divisors (151557078176).

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

81206396352 is a wasteful number, since it uses less digits than its factorization.

81206396352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140983345 (or 140983332 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 81206396352 in words is "eighty-one billion, two hundred six million, three hundred ninety-six thousand, three hundred fifty-two".