66503541 has 32 divisors (see below), whose sum is σ = 103880448. Its totient is φ = 37463040.

The previous prime is 66503537. The next prime is 66503579. The reversal of 66503541 is 14530566.

It is not a de Polignac number, because 66503541 - 2² = 66503537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66503499 and 66503508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66503581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23176 + ... + 25886.

It is an arithmetic number, because the mean of its divisors is an integer number (3246264).

Almost surely, 2^66503541 is an apocalyptic number.

It is an amenable number.

66503541 is a deficient number, since it is larger than the sum of its proper divisors (37376907).

66503541 is a wasteful number, since it uses less digits than its factorization.

66503541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2781.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 66503541 is about 8154.9703249000. The cubic root of 66503541 is about 405.1491418403.

The spelling of 66503541 in words is "sixty-six million, five hundred three thousand, five hundred forty-one".