66026220752399 has 4 divisors (see below), whose sum is σ = 66026245712880. Its totient is φ = 66026195791920.

The previous prime is 66026220752383. The next prime is 66026220752501. The reversal of 66026220752399 is 99325702262066.

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

It is a cyclic number.

It is not a de Polignac number, because 66026220752399 - 2⁴ = 66026220752383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66026220752329) 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, 7968782 + ... + 13984059.

It is an arithmetic number, because the mean of its divisors is an integer number (16506561428220).

Almost surely, 2^{66026220752399} is an apocalyptic number.

66026220752399 is a deficient number, since it is larger than the sum of its proper divisors (24960481).

66026220752399 is a wasteful number, since it uses less digits than its factorization.

66026220752399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24960480.

The product of its (nonzero) digits is 29393280, while the sum is 59.

The spelling of 66026220752399 in words is "sixty-six trillion, twenty-six billion, two hundred twenty million, seven hundred fifty-two thousand, three hundred ninety-nine".