66313501 has 2 divisors, whose sum is σ = 66313502. Its totient is φ = 66313500.

The previous prime is 66313487. The next prime is 66313537. The reversal of 66313501 is 10531366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44876601 + 21436900 = 6699^2 + 4630^2 .

It is a cyclic number.

It is not a de Polignac number, because 66313501 - 2¹⁷ = 66182429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66313001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33156750 + 33156751.

It is an arithmetic number, because the mean of its divisors is an integer number (33156751).

Almost surely, 2^66313501 is an apocalyptic number.

It is an amenable number.

66313501 is a deficient number, since it is larger than the sum of its proper divisors (1).

66313501 is an equidigital number, since it uses as much as digits as its factorization.

66313501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 66313501 is about 8143.3101991758. The cubic root of 66313501 is about 404.7628566487.

Adding to 66313501 its reverse (10531366), we get a palindrome (76844867).

The spelling of 66313501 in words is "sixty-six million, three hundred thirteen thousand, five hundred one".