81304951633404 has 48 divisors (see below), whose sum is σ = 193831116681216. Its totient is φ = 26517793809600.

The previous prime is 81304951633403. The next prime is 81304951633457. The reversal of 81304951633404 is 40433615940318.

It is a super-2 number, since 2×81304951633404² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81304951633403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290625472 + ... + 290905095.

It is an arithmetic number, because the mean of its divisors is an integer number (4038148264192).

Almost surely, 2^{81304951633404} is an apocalyptic number.

It is an amenable number.

81304951633404 is an abundant number, since it is smaller than the sum of its proper divisors (112526165047812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81304951633404 is a wasteful number, since it uses less digits than its factorization.

81304951633404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581530826 (or 581530824 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 51.

The spelling of 81304951633404 in words is "eighty-one trillion, three hundred four billion, nine hundred fifty-one million, six hundred thirty-three thousand, four hundred four".