81742051148 has 6 divisors (see below), whose sum is σ = 143048589516. Its totient is φ = 40871025572.

The previous prime is 81742051091. The next prime is 81742051163. The reversal of 81742051148 is 84115024718.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217756390 + ... + 10217756397.

It is an arithmetic number, because the mean of its divisors is an integer number (23841431586).

Almost surely, 2^81742051148 is an apocalyptic number.

It is an amenable number.

81742051148 is a deficient number, since it is larger than the sum of its proper divisors (61306538368).

81742051148 is a wasteful number, since it uses less digits than its factorization.

81742051148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20435512791 (or 20435512789 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 41.

The spelling of 81742051148 in words is "eighty-one billion, seven hundred forty-two million, fifty-one thousand, one hundred forty-eight".