81741374450 has 18 divisors (see below), whose sum is σ = 152042716839. Its totient is φ = 32695741120.

The previous prime is 81741374383. The next prime is 81741374459. The reversal of 81741374450 is 5447314718.

It can be written as a sum of positive squares in 5 ways, for example, as 4900980049 + 76840394401 = 70007^2 + 277201^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=202165.

It is a super-2 number, since 2×81741374450² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81741374459) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2001434 + ... + 2041866.

Almost surely, 2^81741374450 is an apocalyptic number.

81741374450 is a deficient number, since it is larger than the sum of its proper divisors (70301342389).

81741374450 is an frugal number, since it uses more digits than its factorization.

81741374450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80878 (or 40440 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 44.

The spelling of 81741374450 in words is "eighty-one billion, seven hundred forty-one million, three hundred seventy-four thousand, four hundred fifty".