81830381860408 has 8 divisors (see below), whose sum is σ = 153431965988280. Its totient is φ = 40915190930200.

The previous prime is 81830381860379. The next prime is 81830381860411. The reversal of 81830381860408 is 80406818303818.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×81830381860408² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5114398866268 + ... + 5114398866283.

It is an arithmetic number, because the mean of its divisors is an integer number (19178995748535).

Almost surely, 2^{81830381860408} is an apocalyptic number.

It is an amenable number.

81830381860408 is a deficient number, since it is larger than the sum of its proper divisors (71601584127872).

81830381860408 is a wasteful number, since it uses less digits than its factorization.

81830381860408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10228797732557 (or 10228797732553 counting only the distinct ones).

The product of its (nonzero) digits is 7077888, while the sum is 58.

The spelling of 81830381860408 in words is "eighty-one trillion, eight hundred thirty billion, three hundred eighty-one million, eight hundred sixty thousand, four hundred eight".