66505037 has 4 divisors (see below), whose sum is σ = 70417116. Its totient is φ = 62592960.

The previous prime is 66505031. The next prime is 66505039. The reversal of 66505037 is 73050566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73050566 = 2 ⋅36525283.

It can be written as a sum of positive squares in 2 ways, for example, as 55785961 + 10719076 = 7469^2 + 3274^2 .

It is a cyclic number.

It is not a de Polignac number, because 66505037 - 2¹⁸ = 66242893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66504994 and 66505012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66505031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1956014 + ... + 1956047.

It is an arithmetic number, because the mean of its divisors is an integer number (17604279).

Almost surely, 2^66505037 is an apocalyptic number.

It is an amenable number.

66505037 is a deficient number, since it is larger than the sum of its proper divisors (3912079).

66505037 is a wasteful number, since it uses less digits than its factorization.

66505037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912078.

The product of its (nonzero) digits is 18900, while the sum is 32.

The square root of 66505037 is about 8155.0620475874. The cubic root of 66505037 is about 405.1521797667.

The spelling of 66505037 in words is "sixty-six million, five hundred five thousand, thirty-seven".