81736380444350 has 24 divisors (see below), whose sum is σ = 152205831864000. Its totient is φ = 32656667395520.

The previous prime is 81736380444347. The next prime is 81736380444371. The reversal of 81736380444350 is 5344408363718.

It is a super-2 number, since 2×81736380444350² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 947075975 + ... + 947162274.

It is an arithmetic number, because the mean of its divisors is an integer number (6341909661000).

Almost surely, 2^{81736380444350} is an apocalyptic number.

81736380444350 is a deficient number, since it is larger than the sum of its proper divisors (70469451419650).

81736380444350 is a wasteful number, since it uses less digits than its factorization.

81736380444350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894239124 (or 1894239119 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 56.

The spelling of 81736380444350 in words is "eighty-one trillion, seven hundred thirty-six billion, three hundred eighty million, four hundred forty-four thousand, three hundred fifty".