81730848377 has 4 divisors (see below), whose sum is σ = 81934666356. Its totient is φ = 81527030400.

The previous prime is 81730848323. The next prime is 81730848431. The reversal of 81730848377 is 77384803718.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77384803718 = 2 ⋅38692401859.

It is an interprime number because it is at equal distance from previous prime (81730848323) and next prime (81730848431).

It can be written as a sum of positive squares in 2 ways, for example, as 73348347241 + 8382501136 = 270829^2 + 91556^2 .

It is a cyclic number.

It is not a de Polignac number, because 81730848377 - 2¹² = 81730844281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81730848307) 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, 101908388 + ... + 101909189.

It is an arithmetic number, because the mean of its divisors is an integer number (20483666589).

Almost surely, 2^81730848377 is an apocalyptic number.

It is an amenable number.

81730848377 is a deficient number, since it is larger than the sum of its proper divisors (203817979).

81730848377 is a wasteful number, since it uses less digits than its factorization.

81730848377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203817978.

The product of its (nonzero) digits is 6322176, while the sum is 56.

The spelling of 81730848377 in words is "eighty-one billion, seven hundred thirty million, eight hundred forty-eight thousand, three hundred seventy-seven".