66662261377 has 4 divisors (see below), whose sum is σ = 67755085396. Its totient is φ = 65569437360.

The previous prime is 66662261359. The next prime is 66662261411. The reversal of 66662261377 is 77316226666.

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 33152762241 + 33509499136 = 182079^2 + 183056^2 .

It is a cyclic number.

It is not a de Polignac number, because 66662261377 - 2¹¹ = 66662259329 is a prime.

It is a super-2 number, since 2×66662261377² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66662261327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546411918 + ... + 546412039.

It is an arithmetic number, because the mean of its divisors is an integer number (16938771349).

Almost surely, 2^66662261377 is an apocalyptic number.

It is an amenable number.

66662261377 is a deficient number, since it is larger than the sum of its proper divisors (1092824019).

66662261377 is a wasteful number, since it uses less digits than its factorization.

66662261377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092824018.

The product of its digits is 4572288, while the sum is 52.

The spelling of 66662261377 in words is "sixty-six billion, six hundred sixty-two million, two hundred sixty-one thousand, three hundred seventy-seven".