81668070154 has 32 divisors (see below), whose sum is σ = 135121374720. Its totient is φ = 36710856000.

The previous prime is 81668070103. The next prime is 81668070163. The reversal of 81668070154 is 45107086618.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1896292 + ... + 1938880.

It is an arithmetic number, because the mean of its divisors is an integer number (4222542960).

Almost surely, 2^81668070154 is an apocalyptic number.

81668070154 is a deficient number, since it is larger than the sum of its proper divisors (53453304566).

81668070154 is a wasteful number, since it uses less digits than its factorization.

81668070154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43566.

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 81668070154 in words is "eighty-one billion, six hundred sixty-eight million, seventy thousand, one hundred fifty-four".