81355025270 has 8 divisors (see below), whose sum is σ = 146439045504. Its totient is φ = 32542010104.

The previous prime is 81355025267. The next prime is 81355025369. The reversal of 81355025270 is 7252055318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4067751254 + ... + 4067751273.

It is an arithmetic number, because the mean of its divisors is an integer number (18304880688).

Almost surely, 2^81355025270 is an apocalyptic number.

81355025270 is a deficient number, since it is larger than the sum of its proper divisors (65084020234).

81355025270 is a wasteful number, since it uses less digits than its factorization.

81355025270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8135502534.

The product of its (nonzero) digits is 84000, while the sum is 38.

The spelling of 81355025270 in words is "eighty-one billion, three hundred fifty-five million, twenty-five thousand, two hundred seventy".