66405436 has 6 divisors (see below), whose sum is σ = 116209520. Its totient is φ = 33202716.

The previous prime is 66405431. The next prime is 66405473. The reversal of 66405436 is 63450466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66405431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8300676 + ... + 8300683.

Almost surely, 2^66405436 is an apocalyptic number.

It is an amenable number.

66405436 is a deficient number, since it is larger than the sum of its proper divisors (49804084).

66405436 is a wasteful number, since it uses less digits than its factorization.

66405436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16601363 (or 16601361 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 66405436 is about 8148.9530615902. The cubic root of 66405436 is about 404.9498205371.

The spelling of 66405436 in words is "sixty-six million, four hundred five thousand, four hundred thirty-six".