81878572383 has 4 divisors (see below), whose sum is σ = 109171429848. Its totient is φ = 54585714920.

The previous prime is 81878572357. The next prime is 81878572397. The reversal of 81878572383 is 38327587818.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81878572383 - 2¹² = 81878568287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81878572313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13646428728 + ... + 13646428733.

It is an arithmetic number, because the mean of its divisors is an integer number (27292857462).

Almost surely, 2^81878572383 is an apocalyptic number.

81878572383 is a deficient number, since it is larger than the sum of its proper divisors (27292857465).

81878572383 is a wasteful number, since it uses less digits than its factorization.

81878572383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27292857464.

The product of its digits is 18063360, while the sum is 60.

The spelling of 81878572383 in words is "eighty-one billion, eight hundred seventy-eight million, five hundred seventy-two thousand, three hundred eighty-three".