66443251701 has 16 divisors (see below), whose sum is σ = 89730524160. Its totient is φ = 43725966960.

The previous prime is 66443251687. The next prime is 66443251711. The reversal of 66443251701 is 10715234466.

It is a happy number.

It is not a de Polignac number, because 66443251701 - 2¹³ = 66443243509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66443251701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66443251711) 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 15 ways as a sum of consecutive naturals, for example, 1273906 + ... + 1325036.

It is an arithmetic number, because the mean of its divisors is an integer number (5608157760).

Almost surely, 2^66443251701 is an apocalyptic number.

It is an amenable number.

66443251701 is a deficient number, since it is larger than the sum of its proper divisors (23287272459).

66443251701 is a wasteful number, since it uses less digits than its factorization.

66443251701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56696.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 66443251701 in words is "sixty-six billion, four hundred forty-three million, two hundred fifty-one thousand, seven hundred one".