66405437 has 12 divisors (see below), whose sum is σ = 81313920. Its totient is φ = 53922456.

The previous prime is 66405431. The next prime is 66405473. The reversal of 66405437 is 73450466.

It is not a de Polignac number, because 66405437 - 2⁸ = 66405181 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66405397 and 66405406.

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 in 11 ways as a sum of consecutive naturals, for example, 34733 + ... + 36594.

It is an arithmetic number, because the mean of its divisors is an integer number (6776160).

Almost surely, 2^66405437 is an apocalyptic number.

It is an amenable number.

66405437 is a deficient number, since it is larger than the sum of its proper divisors (14908483).

66405437 is a wasteful number, since it uses less digits than its factorization.

66405437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71360 (or 71353 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 66405437 is about 8148.9531229478. The cubic root of 66405437 is about 404.9498225698.

The spelling of 66405437 in words is "sixty-six million, four hundred five thousand, four hundred thirty-seven".