66605181224389 has 12 divisors (see below), whose sum is σ = 68439568570020. Its totient is φ = 64818617408000.

The previous prime is 66605181224371. The next prime is 66605181224401. The reversal of 66605181224389 is 98342218150666.

It can be written as a sum of positive squares in 6 ways, for example, as 8787863011489 + 57817318212900 = 2964433^2 + 7603770^2 .

It is not a de Polignac number, because 66605181224389 - 2⁹ = 66605181223877 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 (66605181524389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48730354 + ... + 50078515.

It is an arithmetic number, because the mean of its divisors is an integer number (5703297380835).

Almost surely, 2^{66605181224389} is an apocalyptic number.

It is an amenable number.

66605181224389 is a deficient number, since it is larger than the sum of its proper divisors (1834387345631).

66605181224389 is an equidigital number, since it uses as much as digits as its factorization.

66605181224389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98809352 (or 98809311 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 61.

The spelling of 66605181224389 in words is "sixty-six trillion, six hundred five billion, one hundred eighty-one million, two hundred twenty-four thousand, three hundred eighty-nine".