81154704658 has 16 divisors (see below), whose sum is σ = 123385822560. Its totient is φ = 40027582336.

The previous prime is 81154704613. The next prime is 81154704661. The reversal of 81154704658 is 85640745118.

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, 261535 + ... + 480322.

It is an arithmetic number, because the mean of its divisors is an integer number (7711613910).

Almost surely, 2^81154704658 is an apocalyptic number.

81154704658 is a deficient number, since it is larger than the sum of its proper divisors (42231117902).

81154704658 is a wasteful number, since it uses less digits than its factorization.

81154704658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742601.

The product of its (nonzero) digits is 1075200, while the sum is 49.

The spelling of 81154704658 in words is "eighty-one billion, one hundred fifty-four million, seven hundred four thousand, six hundred fifty-eight".