66503763 has 24 divisors (see below), whose sum is σ = 101084256. Its totient is φ = 42076800.

The previous prime is 66503761. The next prime is 66503771. The reversal of 66503763 is 36730566.

It is not a de Polignac number, because 66503763 - 2¹ = 66503761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66503761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11218 + ... + 16088.

It is an arithmetic number, because the mean of its divisors is an integer number (4211844).

Almost surely, 2^66503763 is an apocalyptic number.

66503763 is a deficient number, since it is larger than the sum of its proper divisors (34580493).

66503763 is a wasteful number, since it uses less digits than its factorization.

66503763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4955 (or 4952 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 36.

The square root of 66503763 is about 8154.9839362196. The cubic root of 66503763 is about 405.1495926585.

The spelling of 66503763 in words is "sixty-six million, five hundred three thousand, seven hundred sixty-three".