66550663433 has 8 divisors (see below), whose sum is σ = 68349120840. Its totient is φ = 64760552320.

The previous prime is 66550663411. The next prime is 66550663441. The reversal of 66550663433 is 33436605566.

It can be written as a sum of positive squares in 4 ways, for example, as 1284720649 + 65265942784 = 35843^2 + 255472^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66550663433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66550663033) 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, 2070410 + ... + 2102307.

It is an arithmetic number, because the mean of its divisors is an integer number (8543640105).

Almost surely, 2^66550663433 is an apocalyptic number.

It is an amenable number.

66550663433 is a deficient number, since it is larger than the sum of its proper divisors (1798457407).

66550663433 is a wasteful number, since it uses less digits than its factorization.

66550663433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4173147.

The product of its (nonzero) digits is 3499200, while the sum is 47.

The spelling of 66550663433 in words is "sixty-six billion, five hundred fifty million, six hundred sixty-three thousand, four hundred thirty-three".