81441798402 has 16 divisors (see below), whose sum is σ = 165114879840. Its totient is φ = 26775385632.

The previous prime is 81441798367. The next prime is 81441798413. The reversal of 81441798402 is 20489714418.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92969652 + ... + 92970527.

It is an arithmetic number, because the mean of its divisors is an integer number (10319679990).

Almost surely, 2^81441798402 is an apocalyptic number.

81441798402 is an abundant number, since it is smaller than the sum of its proper divisors (83673081438).

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

81441798402 is a wasteful number, since it uses less digits than its factorization.

81441798402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185940257.

The product of its (nonzero) digits is 516096, while the sum is 48.

The spelling of 81441798402 in words is "eighty-one billion, four hundred forty-one million, seven hundred ninety-eight thousand, four hundred two".