66648501 has 10 divisors (see below), whose sum is σ = 99561462. Its totient is φ = 44432280.

The previous prime is 66648479. The next prime is 66648509. The reversal of 66648501 is 10584666.

It can be written as a sum of positive squares in only one way, i.e., 38452401 + 28196100 = 6201^2 + 5310^2 .

It is not a de Polignac number, because 66648501 - 2⁶ = 66648437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66648509) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 411330 + ... + 411491.

Almost surely, 2^66648501 is an apocalyptic number.

It is an amenable number.

66648501 is a deficient number, since it is larger than the sum of its proper divisors (32912961).

66648501 is an equidigital number, since it uses as much as digits as its factorization.

66648501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822833 (or 822824 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 66648501 is about 8163.8533181335. The cubic root of 66648501 is about 405.4433006079.

The spelling of 66648501 in words is "sixty-six million, six hundred forty-eight thousand, five hundred one".