66500517205106 has 4 divisors (see below), whose sum is σ = 99750775807662. Its totient is φ = 33250258602552.

The previous prime is 66500517205091. The next prime is 66500517205151. The reversal of 66500517205106 is 60150271500566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 57068339900881 + 9432177304225 = 7554359^2 + 3071185^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16625129301275 + ... + 16625129301278.

Almost surely, 2^{66500517205106} is an apocalyptic number.

66500517205106 is a deficient number, since it is larger than the sum of its proper divisors (33250258602556).

66500517205106 is a wasteful number, since it uses less digits than its factorization.

66500517205106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33250258602555.

The product of its (nonzero) digits is 378000, while the sum is 44.

The spelling of 66500517205106 in words is "sixty-six trillion, five hundred billion, five hundred seventeen million, two hundred five thousand, one hundred six".