66344159477 has 8 divisors (see below), whose sum is σ = 66609801912. Its totient is φ = 66078705600.

The previous prime is 66344159449. The next prime is 66344159513. The reversal of 66344159477 is 77495144366.

It can be written as a sum of positive squares in 4 ways, for example, as 18887279761 + 47456879716 = 137431^2 + 217846^2 .

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 66344159477 - 2¹⁶ = 66344093941 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 (66344158477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680327 + ... + 771707.

It is an arithmetic number, because the mean of its divisors is an integer number (8326225239).

Almost surely, 2^66344159477 is an apocalyptic number.

It is an amenable number.

66344159477 is a deficient number, since it is larger than the sum of its proper divisors (265642435).

66344159477 is a wasteful number, since it uses less digits than its factorization.

66344159477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94279.

The product of its digits is 15240960, while the sum is 56.

The spelling of 66344159477 in words is "sixty-six billion, three hundred forty-four million, one hundred fifty-nine thousand, four hundred seventy-seven".