81003771000004 has 24 divisors (see below), whose sum is σ = 142260381525528. Its totient is φ = 40358201345280.

The previous prime is 81003770999971. The next prime is 81003771000007. The reversal of 81003771000004 is 40000017730018.

It can be written as a sum of positive squares in 4 ways, for example, as 2755593360004 + 78248177640000 = 1659998^2 + 8845800^2 .

It is a super-2 number, since 2×81003771000004² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81003771000004.

It is not an unprimeable number, because it can be changed into a prime (81003771000007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30426727 + ... + 32981710.

It is an arithmetic number, because the mean of its divisors is an integer number (5927515896897).

Almost surely, 2^{81003771000004} is an apocalyptic number.

It is an amenable number.

81003771000004 is a deficient number, since it is larger than the sum of its proper divisors (61256610525524).

81003771000004 is a wasteful number, since it uses less digits than its factorization.

81003771000004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63409575 (or 63409573 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The spelling of 81003771000004 in words is "eighty-one trillion, three billion, seven hundred seventy-one million, four", and thus it is an aban number.