66500079418 has 4 divisors (see below), whose sum is σ = 99750119130. Its totient is φ = 33250039708.

The previous prime is 66500079407. The next prime is 66500079431. The reversal of 66500079418 is 81497000566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81497000566 = 2 ⋅40748500283.

It can be written as a sum of positive squares in only one way, i.e., 44023173489 + 22476905929 = 209817^2 + 149923^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16625019853 + ... + 16625019856.

Almost surely, 2^66500079418 is an apocalyptic number.

66500079418 is a deficient number, since it is larger than the sum of its proper divisors (33250039712).

66500079418 is a wasteful number, since it uses less digits than its factorization.

66500079418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33250039711.

The product of its (nonzero) digits is 362880, while the sum is 46.

It can be divided in two parts, 6650007 and 9418, that added together give a triangular number (6659425 = T₃₆₄₉).

The spelling of 66500079418 in words is "sixty-six billion, five hundred million, seventy-nine thousand, four hundred eighteen".