81252033405 has 8 divisors (see below), whose sum is σ = 130003253472. Its totient is φ = 43334417808.

The previous prime is 81252033389. The next prime is 81252033451. The reversal of 81252033405 is 50433025218.

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

It is not a de Polignac number, because 81252033405 - 2⁴ = 81252033389 is a prime.

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, 2708401099 + ... + 2708401128.

It is an arithmetic number, because the mean of its divisors is an integer number (16250406684).

Almost surely, 2^81252033405 is an apocalyptic number.

It is an amenable number.

81252033405 is a deficient number, since it is larger than the sum of its proper divisors (48751220067).

81252033405 is a wasteful number, since it uses less digits than its factorization.

81252033405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5416802235.

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 81252033405 in words is "eighty-one billion, two hundred fifty-two million, thirty-three thousand, four hundred five".