666053658106 has 4 divisors (see below), whose sum is σ = 999080487162. Its totient is φ = 333026829052.

The previous prime is 666053658097. The next prime is 666053658139. The reversal of 666053658106 is 601856350666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 601856350666 = 2 ⋅300928175333.

It can be written as a sum of positive squares in only one way, i.e., 488272525225 + 177781132881 = 698765^2 + 421641^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166513414525 + ... + 166513414528.

Almost surely, 2^666053658106 is an apocalyptic number.

666053658106 is a deficient number, since it is larger than the sum of its proper divisors (333026829056).

666053658106 is a wasteful number, since it uses less digits than its factorization.

666053658106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333026829055.

The product of its (nonzero) digits is 4665600, while the sum is 52.

The spelling of 666053658106 in words is "six hundred sixty-six billion, fifty-three million, six hundred fifty-eight thousand, one hundred six".