66859045533 has 30 divisors (see below), whose sum is σ = 112663205694. Its totient is φ = 38205156528.

The previous prime is 66859045523. The next prime is 66859045543. The reversal of 66859045533 is 33554095866.

It is a happy number.

66859045533 is a `hidden beast` number, since 6 + 6 + 8 + 590 + 45 + 5 + 3 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (66859045523) and next prime (66859045543).

It can be written as a sum of positive squares in only one way, i.e., 51648016644 + 15211028889 = 227262^2 + 123333^2 .

It is not a de Polignac number, because 66859045533 - 2¹⁰ = 66859044509 is a prime.

It is a super-4 number, since 4×66859045533⁴ (a number of 44 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66859045533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66859045523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1525410 + ... + 1568627.

Almost surely, 2^66859045533 is an apocalyptic number.

66859045533 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

66859045533 is a deficient number, since it is larger than the sum of its proper divisors (45804160161).

66859045533 is an equidigital number, since it uses as much as digits as its factorization.

66859045533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3094071 (or 3094047 counting only the distinct ones).

The product of its (nonzero) digits is 11664000, while the sum is 54.

The spelling of 66859045533 in words is "sixty-six billion, eight hundred fifty-nine million, forty-five thousand, five hundred thirty-three".