81344355004 has 24 divisors (see below), whose sum is σ = 155938161456. Its totient is φ = 36821280000.

The previous prime is 81344354999. The next prime is 81344355007. The reversal of 81344355004 is 40055344318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81344355007) 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, 3824947 + ... + 3846154.

It is an arithmetic number, because the mean of its divisors is an integer number (6497423394).

Almost surely, 2^81344355004 is an apocalyptic number.

It is an amenable number.

81344355004 is a deficient number, since it is larger than the sum of its proper divisors (74593806452).

81344355004 is a wasteful number, since it uses less digits than its factorization.

81344355004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7671357 (or 7671355 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 81344355004 in words is "eighty-one billion, three hundred forty-four million, three hundred fifty-five thousand, four".