81307837322 has 16 divisors (see below), whose sum is σ = 126119676672. Its totient is φ = 39272604960.

The previous prime is 81307837309. The next prime is 81307837333. The reversal of 81307837322 is 22373870318.

It is a happy number.

It is a super-2 number, since 2×81307837322² (a number of 23 digits) contains 22 as substring.

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, 1129763 + ... + 1199574.

It is an arithmetic number, because the mean of its divisors is an integer number (7882479792).

Almost surely, 2^81307837322 is an apocalyptic number.

81307837322 is a deficient number, since it is larger than the sum of its proper divisors (44811839350).

81307837322 is a wasteful number, since it uses less digits than its factorization.

81307837322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329933.

The product of its (nonzero) digits is 338688, while the sum is 44.

The spelling of 81307837322 in words is "eighty-one billion, three hundred seven million, eight hundred thirty-seven thousand, three hundred twenty-two".