81064120319 has 48 divisors (see below), whose sum is σ = 102266841600. Its totient is φ = 62898945408.

The previous prime is 81064120303. The next prime is 81064120321. The reversal of 81064120319 is 91302146018.

It is not a de Polignac number, because 81064120319 - 2⁴ = 81064120303 is a prime.

It is a super-2 number, since 2×81064120319² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81064120219) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35106737 + ... + 35109045.

It is an arithmetic number, because the mean of its divisors is an integer number (2130559200).

Almost surely, 2^81064120319 is an apocalyptic number.

81064120319 is a deficient number, since it is larger than the sum of its proper divisors (21202721281).

81064120319 is a wasteful number, since it uses less digits than its factorization.

81064120319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2904 (or 2891 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 81064120319 in words is "eighty-one billion, sixty-four million, one hundred twenty thousand, three hundred nineteen".