66550442237 has 8 divisors (see below), whose sum is σ = 68355955416. Its totient is φ = 64745289792.

The previous prime is 66550442183. The next prime is 66550442243. The reversal of 66550442237 is 73224405566.

It can be written as a sum of positive squares in 4 ways, for example, as 86508601 + 66463933636 = 9301^2 + 257806^2 .

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 66550442237 - 2¹⁴ = 66550425853 is a prime.

It is a super-2 number, since 2×66550442237² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66550442137) 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, 307223 + ... + 476955.

It is an arithmetic number, because the mean of its divisors is an integer number (8544494427).

Almost surely, 2^66550442237 is an apocalyptic number.

It is an amenable number.

66550442237 is a deficient number, since it is larger than the sum of its proper divisors (1805513179).

66550442237 is a wasteful number, since it uses less digits than its factorization.

66550442237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180367.

The product of its (nonzero) digits is 1209600, while the sum is 44.

The spelling of 66550442237 in words is "sixty-six billion, five hundred fifty million, four hundred forty-two thousand, two hundred thirty-seven".