66512062022165 has 4 divisors (see below), whose sum is σ = 79814474426604. Its totient is φ = 53209649617728.

The previous prime is 66512062022143. The next prime is 66512062022171. The reversal of 66512062022165 is 56122026021566.

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 19898370856081 + 46613691166084 = 4460759^2 + 6827422^2 .

It is a cyclic number.

It is not a de Polignac number, because 66512062022165 - 2⁶ = 66512062022101 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 6651206202212 + ... + 6651206202221.

It is an arithmetic number, because the mean of its divisors is an integer number (19953618606651).

Almost surely, 2^{66512062022165} is an apocalyptic number.

It is an amenable number.

66512062022165 is a deficient number, since it is larger than the sum of its proper divisors (13302412404439).

66512062022165 is a wasteful number, since it uses less digits than its factorization.

66512062022165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13302412404438.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 66512062022165 in words is "sixty-six trillion, five hundred twelve billion, sixty-two million, twenty-two thousand, one hundred sixty-five".