666603234557 has 48 divisors (see below), whose sum is σ = 785767395840. Its totient is φ = 560903616000.

The previous prime is 666603234523. The next prime is 666603234559. The reversal of 666603234557 is 755432306666.

It is not a de Polignac number, because 666603234557 - 2¹⁶ = 666603169021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666603234499 and 666603234508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666603234559) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19628882 + ... + 19662812.

It is an arithmetic number, because the mean of its divisors is an integer number (16370154080).

Almost surely, 2^666603234557 is an apocalyptic number.

It is an amenable number.

666603234557 is a deficient number, since it is larger than the sum of its proper divisors (119164161283).

666603234557 is a wasteful number, since it uses less digits than its factorization.

666603234557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34086 (or 34045 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 53.

The spelling of 666603234557 in words is "six hundred sixty-six billion, six hundred three million, two hundred thirty-four thousand, five hundred fifty-seven".