42820666106 has 4 divisors (see below), whose sum is σ = 64230999162. Its totient is φ = 21410333052.

The previous prime is 42820666081. The next prime is 42820666151. The reversal of 42820666106 is 60166602824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21753595081 + 21067071025 = 147491^2 + 145145^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10705166525 + ... + 10705166528.

Almost surely, 2^42820666106 is an apocalyptic number.

42820666106 is a deficient number, since it is larger than the sum of its proper divisors (21410333056).

42820666106 is a wasteful number, since it uses less digits than its factorization.

42820666106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21410333055.

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 42820666106 in words is "forty-two billion, eight hundred twenty million, six hundred sixty-six thousand, one hundred six".