66642220037 has 2 divisors, whose sum is σ = 66642220038. Its totient is φ = 66642220036.

The previous prime is 66642220003. The next prime is 66642220039. The reversal of 66642220037 is 73002224666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66618707236 + 23512801 = 258106^2 + 4849^2 .

It is a cyclic number.

It is not a de Polignac number, because 66642220037 - 2¹⁴ = 66642203653 is a prime.

Together with 66642220039, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66642220039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33321110018 + 33321110019.

It is an arithmetic number, because the mean of its divisors is an integer number (33321110019).

Almost surely, 2^66642220037 is an apocalyptic number.

It is an amenable number.

66642220037 is a deficient number, since it is larger than the sum of its proper divisors (1).

66642220037 is an equidigital number, since it uses as much as digits as its factorization.

66642220037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 38.

The spelling of 66642220037 in words is "sixty-six billion, six hundred forty-two million, two hundred twenty thousand, thirty-seven".