66300561 has 12 divisors (see below), whose sum is σ = 101401092. Its totient is φ = 41600256.

The previous prime is 66300529. The next prime is 66300593. The reversal of 66300561 is 16500366.

It is an interprime number because it is at equal distance from previous prime (66300529) and next prime (66300593).

It can be written as a sum of positive squares in 2 ways, for example, as 45643536 + 20657025 = 6756^2 + 4545^2 .

It is not a de Polignac number, because 66300561 - 2⁵ = 66300529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66300511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 216516 + ... + 216821.

It is an arithmetic number, because the mean of its divisors is an integer number (8450091).

Almost surely, 2^66300561 is an apocalyptic number.

It is an amenable number.

66300561 is a deficient number, since it is larger than the sum of its proper divisors (35100531).

66300561 is a wasteful number, since it uses less digits than its factorization.

66300561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433360 (or 433357 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 66300561 is about 8142.5156432149. The cubic root of 66300561 is about 404.7365273090.

The spelling of 66300561 in words is "sixty-six million, three hundred thousand, five hundred sixty-one".