66858408834 has 32 divisors (see below), whose sum is σ = 154660423680. Its totient is φ = 18872252112.

The previous prime is 66858408787. The next prime is 66858408863. The reversal of 66858408834 is 43880485866.

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, 9586074 + ... + 9593045.

It is an arithmetic number, because the mean of its divisors is an integer number (4833138240).

Almost surely, 2^66858408834 is an apocalyptic number.

66858408834 is an abundant number, since it is smaller than the sum of its proper divisors (87802014846).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66858408834 is a wasteful number, since it uses less digits than its factorization.

66858408834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19179214.

The product of its (nonzero) digits is 35389440, while the sum is 60.

The spelling of 66858408834 in words is "sixty-six billion, eight hundred fifty-eight million, four hundred eight thousand, eight hundred thirty-four".