81025420852 has 24 divisors (see below), whose sum is σ = 142215020640. Its totient is φ = 40392699360.

The previous prime is 81025420811. The next prime is 81025420871. The reversal of 81025420852 is 25802452018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2393299 + ... + 2426917.

It is an arithmetic number, because the mean of its divisors is an integer number (5925625860).

Almost surely, 2^81025420852 is an apocalyptic number.

It is an amenable number.

81025420852 is a deficient number, since it is larger than the sum of its proper divisors (61189599788).

81025420852 is a wasteful number, since it uses less digits than its factorization.

81025420852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35391 (or 35389 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 37.

The spelling of 81025420852 in words is "eighty-one billion, twenty-five million, four hundred twenty thousand, eight hundred fifty-two".