81307837323 has 12 divisors (see below), whose sum is σ = 117447604560. Its totient is φ = 54203863056.

The previous prime is 81307837309. The next prime is 81307837333. The reversal of 81307837323 is 32373870318.

It is not a de Polignac number, because 81307837323 - 2⁴ = 81307837307 is a prime.

It is a super-2 number, since 2×81307837323² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81307837333) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 375565 + ... + 551057.

It is an arithmetic number, because the mean of its divisors is an integer number (9787300380).

Almost surely, 2^81307837323 is an apocalyptic number.

81307837323 is a deficient number, since it is larger than the sum of its proper divisors (36139767237).

81307837323 is a wasteful number, since it uses less digits than its factorization.

81307837323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226978 (or 226975 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The spelling of 81307837323 in words is "eighty-one billion, three hundred seven million, eight hundred thirty-seven thousand, three hundred twenty-three".