81346742450 has 24 divisors (see below), whose sum is σ = 151954340148. Its totient is φ = 32399041280.

The previous prime is 81346742431. The next prime is 81346742461. The reversal of 81346742450 is 5424764318.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 33079970641 + 48266771809 = 181879^2 + 219697^2 .

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, 3479627 + ... + 3502926.

Almost surely, 2^81346742450 is an apocalyptic number.

81346742450 is a deficient number, since it is larger than the sum of its proper divisors (70607597698).

81346742450 is a wasteful number, since it uses less digits than its factorization.

81346742450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6982798 (or 6982793 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 44.

The spelling of 81346742450 in words is "eighty-one billion, three hundred forty-six million, seven hundred forty-two thousand, four hundred fifty".