66503073 has 64 divisors (see below), whose sum is σ = 114573312. Its totient is φ = 33384960.

The previous prime is 66503057. The next prime is 66503077. The reversal of 66503073 is 37030566.

It is not a de Polignac number, because 66503073 - 2⁴ = 66503057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66503073.

It is not an unprimeable number, because it can be changed into a prime (66503077) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 910965 + ... + 911037.

It is an arithmetic number, because the mean of its divisors is an integer number (1790208).

Almost surely, 2^66503073 is an apocalyptic number.

It is an amenable number.

66503073 is a deficient number, since it is larger than the sum of its proper divisors (48070239).

66503073 is a wasteful number, since it uses less digits than its factorization.

66503073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214.

The product of its (nonzero) digits is 11340, while the sum is 30.

The square root of 66503073 is about 8154.9416306924. The cubic root of 66503073 is about 405.1481914637.

The spelling of 66503073 in words is "sixty-six million, five hundred three thousand, seventy-three".