66505022254505 has 4 divisors (see below), whose sum is σ = 79806026705412. Its totient is φ = 53204017803600.

The previous prime is 66505022254499. The next prime is 66505022254589. The reversal of 66505022254505 is 50545222050566.

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

It can be written as a sum of positive squares in 2 ways, for example, as 46478538045289 + 20026484209216 = 6817517^2 + 4475096^2 .

It is not a de Polignac number, because 66505022254505 - 2³⁰ = 66503948512681 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66505022254505.

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, 6650502225446 + ... + 6650502225455.

It is an arithmetic number, because the mean of its divisors is an integer number (19951506676353).

Almost surely, 2^{66505022254505} is an apocalyptic number.

It is an amenable number.

66505022254505 is a deficient number, since it is larger than the sum of its proper divisors (13301004450907).

66505022254505 is a wasteful number, since it uses less digits than its factorization.

66505022254505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13301004450906.

The product of its (nonzero) digits is 3600000, while the sum is 47.

The spelling of 66505022254505 in words is "sixty-six trillion, five hundred five billion, twenty-two million, two hundred fifty-four thousand, five hundred five".