66572145389 has 2 divisors, whose sum is σ = 66572145390. Its totient is φ = 66572145388.

The previous prime is 66572145379. The next prime is 66572145407. The reversal of 66572145389 is 98354127566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64449976900 + 2122168489 = 253870^2 + 46067^2 .

It is a cyclic number.

It is not a de Polignac number, because 66572145389 - 2²⁸ = 66303709933 is a prime.

It is a super-2 number, since 2×66572145389² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66572145349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33286072694 + 33286072695.

It is an arithmetic number, because the mean of its divisors is an integer number (33286072695).

Almost surely, 2^66572145389 is an apocalyptic number.

It is an amenable number.

66572145389 is a deficient number, since it is larger than the sum of its proper divisors (1).

66572145389 is an equidigital number, since it uses as much as digits as its factorization.

66572145389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10886400, while the sum is 56.

The spelling of 66572145389 in words is "sixty-six billion, five hundred seventy-two million, one hundred forty-five thousand, three hundred eighty-nine".