66376145770505 has 4 divisors (see below), whose sum is σ = 79651374924612. Its totient is φ = 53100916616400.

The previous prime is 66376145770477. The next prime is 66376145770513. The reversal of 66376145770505 is 50507754167366.

It is a happy number.

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 35548210421824 + 30827935348681 = 5962232^2 + 5552291^2 .

It is not a de Polignac number, because 66376145770505 - 2¹⁰ = 66376145769481 is a prime.

It is a Duffinian 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, 6637614577046 + ... + 6637614577055.

It is an arithmetic number, because the mean of its divisors is an integer number (19912843731153).

Almost surely, 2^{66376145770505} is an apocalyptic number.

It is an amenable number.

66376145770505 is a deficient number, since it is larger than the sum of its proper divisors (13275229154107).

66376145770505 is a wasteful number, since it uses less digits than its factorization.

66376145770505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13275229154106.

The product of its (nonzero) digits is 111132000, while the sum is 62.

The spelling of 66376145770505 in words is "sixty-six trillion, three hundred seventy-six billion, one hundred forty-five million, seven hundred seventy thousand, five hundred five".