81875333205 has 24 divisors (see below), whose sum is σ = 142312584960. Its totient is φ = 43545201120.

The previous prime is 81875333161. The next prime is 81875333209. The reversal of 81875333205 is 50233357818.

81875333205 is a `hidden beast` number, since 8 + 1 + 87 + 533 + 32 + 0 + 5 = 666.

It is not a de Polignac number, because 81875333205 - 2⁷ = 81875333077 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81875333209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2517901 + ... + 2550210.

It is an arithmetic number, because the mean of its divisors is an integer number (5929691040).

Almost surely, 2^81875333205 is an apocalyptic number.

It is an amenable number.

81875333205 is a deficient number, since it is larger than the sum of its proper divisors (60437251755).

81875333205 is a wasteful number, since it uses less digits than its factorization.

81875333205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5068481 (or 5068478 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 81875333205 in words is "eighty-one billion, eight hundred seventy-five million, three hundred thirty-three thousand, two hundred five".