666120100603 has 4 divisors (see below), whose sum is σ = 666122554288. Its totient is φ = 666117646920.

The previous prime is 666120100601. The next prime is 666120100609. The reversal of 666120100603 is 306001021666.

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

It is a cyclic number.

It is not a de Polignac number, because 666120100603 - 2¹ = 666120100601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666120100601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 760551 + ... + 1382272.

It is an arithmetic number, because the mean of its divisors is an integer number (166530638572).

Almost surely, 2^666120100603 is an apocalyptic number.

666120100603 is a deficient number, since it is larger than the sum of its proper divisors (2453685).

666120100603 is a wasteful number, since it uses less digits than its factorization.

666120100603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2453684.

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 666120100603 in words is "six hundred sixty-six billion, one hundred twenty million, one hundred thousand, six hundred three".