66503265 has 16 divisors (see below), whose sum is σ = 106668096. Its totient is φ = 35380800.

The previous prime is 66503263. The next prime is 66503267. The reversal of 66503265 is 56230566.

It is an interprime number because it is at equal distance from previous prime (66503263) and next prime (66503267).

It is not a de Polignac number, because 66503265 - 2¹ = 66503263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66503263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1050 + ... + 11580.

It is an arithmetic number, because the mean of its divisors is an integer number (6666756).

Almost surely, 2^66503265 is an apocalyptic number.

It is an amenable number.

66503265 is a deficient number, since it is larger than the sum of its proper divisors (40164831).

66503265 is a wasteful number, since it uses less digits than its factorization.

66503265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10960.

The product of its (nonzero) digits is 32400, while the sum is 33.

The square root of 66503265 is about 8154.9534026872. The cubic root of 66503265 is about 405.1485813623.

The spelling of 66503265 in words is "sixty-six million, five hundred three thousand, two hundred sixty-five".