66194818554 has 8 divisors (see below), whose sum is σ = 132389637120. Its totient is φ = 22064939516.

The previous prime is 66194818549. The next prime is 66194818567. The reversal of 66194818554 is 45581849166.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

66194818554 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 66194818494 and 66194818503.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5516234874 + ... + 5516234885.

It is an arithmetic number, because the mean of its divisors is an integer number (16548704640).

Almost surely, 2^66194818554 is an apocalyptic number.

66194818554 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66194818554 is a wasteful number, since it uses less digits than its factorization.

66194818554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11032469764.

The product of its digits is 8294400, while the sum is 57.

The spelling of 66194818554 in words is "sixty-six billion, one hundred ninety-four million, eight hundred eighteen thousand, five hundred fifty-four".