666436 has 6 divisors (see below), whose sum is σ = 1166270. Its totient is φ = 333216.

The previous prime is 666433. The next prime is 666437. The reversal of 666436 is 634666.

It can be written as a sum of positive squares in only one way, i.e., 352836 + 313600 = 594^2 + 560^2 .

It is a pancake number, because a pancake can be divided into 666436 parts by 1154 straight cuts.

It is a junction number, because it is equal to n+sod(n) for n = 666398 and 666407.

It is not an unprimeable number, because it can be changed into a prime (666431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83301 + ... + 83308.

2⁶⁶⁶⁴³⁶ is an apocalyptic number.

It is an amenable number.

666436 is a deficient number, since it is larger than the sum of its proper divisors (499834).

666436 is a wasteful number, since it uses less digits than its factorization.

666436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166613 (or 166611 counting only the distinct ones).

The product of its digits is 15552, while the sum is 31.

The square root of 666436 is about 816.3553147986. The cubic root of 666436 is about 87.3479700167.

The spelling of 666436 in words is "six hundred sixty-six thousand, four hundred thirty-six".