665734437566 has 16 divisors (see below), whose sum is σ = 1089799991280. Its totient is φ = 302490905280.

The previous prime is 665734437551. The next prime is 665734437611.

665734437566 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×665734437566² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665734437499 and 665734437508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5723981 + ... + 5839128.

It is an arithmetic number, because the mean of its divisors is an integer number (68112499455).

Almost surely, 2^665734437566 is an apocalyptic number.

665734437566 is a deficient number, since it is larger than the sum of its proper divisors (424065553714).

665734437566 is a wasteful number, since it uses less digits than its factorization.

665734437566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11565739.

The product of its digits is 228614400, while the sum is 62.

The spelling of 665734437566 in words is "six hundred sixty-five billion, seven hundred thirty-four million, four hundred thirty-seven thousand, five hundred sixty-six".