66700406573 has 8 divisors (see below), whose sum is σ = 66862426680. Its totient is φ = 66538517760.

The previous prime is 66700406537. The next prime is 66700406587. The reversal of 66700406573 is 37560400766.

It can be written as a sum of positive squares in 4 ways, for example, as 4909384489 + 61791022084 = 70067^2 + 248578^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66700406573 - 2¹⁸ = 66700144429 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 (66700406273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1025561 + ... + 1088657.

It is an arithmetic number, because the mean of its divisors is an integer number (8357803335).

Almost surely, 2^66700406573 is an apocalyptic number.

It is an amenable number.

66700406573 is a deficient number, since it is larger than the sum of its proper divisors (162020107).

66700406573 is a wasteful number, since it uses less digits than its factorization.

66700406573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65647.

The product of its (nonzero) digits is 635040, while the sum is 44.

The spelling of 66700406573 in words is "sixty-six billion, seven hundred million, four hundred six thousand, five hundred seventy-three".