81243496450 has 24 divisors (see below), whose sum is σ = 155987516160. Its totient is φ = 31449094800.

The previous prime is 81243496429. The next prime is 81243496483. The reversal of 81243496450 is 5469434218.

It is a super-3 number, since 3×81243496450³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81243496450.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26206030 + ... + 26209129.

It is an arithmetic number, because the mean of its divisors is an integer number (6499479840).

Almost surely, 2^81243496450 is an apocalyptic number.

81243496450 is a deficient number, since it is larger than the sum of its proper divisors (74744019710).

81243496450 is a wasteful number, since it uses less digits than its factorization.

81243496450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52415202 (or 52415197 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 46.

The spelling of 81243496450 in words is "eighty-one billion, two hundred forty-three million, four hundred ninety-six thousand, four hundred fifty".