66666733394 has 8 divisors (see below), whose sum is σ = 100006843260. Its totient is φ = 33331118976.

The previous prime is 66666733369. The next prime is 66666733411. The reversal of 66666733394 is 49333766666.

It can be written as a sum of positive squares in 2 ways, for example, as 59528680225 + 7138053169 = 243985^2 + 84487^2 .

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

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, 1086539 + ... + 1146254.

Almost surely, 2^66666733394 is an apocalyptic number.

66666733394 is a deficient number, since it is larger than the sum of its proper divisors (33340109866).

66666733394 is a wasteful number, since it uses less digits than its factorization.

66666733394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2247724.

The product of its digits is 52907904, while the sum is 59.

The spelling of 66666733394 in words is "sixty-six billion, six hundred sixty-six million, seven hundred thirty-three thousand, three hundred ninety-four".