666555205414 has 16 divisors (see below), whose sum is σ = 1142709055488. Its totient is φ = 285655769352.

The previous prime is 666555205399. The next prime is 666555205489. The reversal of 666555205414 is 414502555666.

It is a super-2 number, since 2×666555205414² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504294 + ... + 1259929.

It is an arithmetic number, because the mean of its divisors is an integer number (71419315968).

Almost surely, 2^666555205414 is an apocalyptic number.

666555205414 is a deficient number, since it is larger than the sum of its proper divisors (476153850074).

666555205414 is a wasteful number, since it uses less digits than its factorization.

666555205414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1791219.

The product of its (nonzero) digits is 4320000, while the sum is 49.

The spelling of 666555205414 in words is "six hundred sixty-six billion, five hundred fifty-five million, two hundred five thousand, four hundred fourteen".