81155127742 has 16 divisors (see below), whose sum is σ = 132756200640. Its totient is φ = 36982082592.

The previous prime is 81155127707. The next prime is 81155127769. The reversal of 81155127742 is 24772155118.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19753333 + ... + 19757440.

It is an arithmetic number, because the mean of its divisors is an integer number (8297262540).

Almost surely, 2^81155127742 is an apocalyptic number.

81155127742 is a deficient number, since it is larger than the sum of its proper divisors (51601072898).

81155127742 is a wasteful number, since it uses less digits than its factorization.

81155127742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39510867.

The product of its digits is 156800, while the sum is 43.

The spelling of 81155127742 in words is "eighty-one billion, one hundred fifty-five million, one hundred twenty-seven thousand, seven hundred forty-two".