81018697058 has 32 divisors (see below), whose sum is σ = 136859538816. Its totient is φ = 35690738688.

The previous prime is 81018697051. The next prime is 81018697061. The reversal of 81018697058 is 85079681018.

It is not an unprimeable number, because it can be changed into a prime (81018697051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134210 + ... + 424322.

It is an arithmetic number, because the mean of its divisors is an integer number (4276860588).

Almost surely, 2^81018697058 is an apocalyptic number.

81018697058 is a deficient number, since it is larger than the sum of its proper divisors (55840841758).

81018697058 is a wasteful number, since it uses less digits than its factorization.

81018697058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290618.

The product of its (nonzero) digits is 967680, while the sum is 53.

The spelling of 81018697058 in words is "eighty-one billion, eighteen million, six hundred ninety-seven thousand, fifty-eight".