66361716 has 36 divisors (see below), whose sum is σ = 175043232. Its totient is φ = 21158544.

The previous prime is 66361709. The next prime is 66361723. The reversal of 66361716 is 61716366.

66361716 is a `hidden beast` number, since 6 + 636 + 1 + 7 + 16 = 666.

It is an interprime number because it is at equal distance from previous prime (66361709) and next prime (66361723).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39246 + ... + 40901.

It is an arithmetic number, because the mean of its divisors is an integer number (4862312).

Almost surely, 2^66361716 is an apocalyptic number.

It is an amenable number.

66361716 is an abundant number, since it is smaller than the sum of its proper divisors (108681516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66361716 is a wasteful number, since it uses less digits than its factorization.

66361716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80180 (or 80175 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 66361716 is about 8146.2700667238. The cubic root of 66361716 is about 404.8609307611.

The spelling of 66361716 in words is "sixty-six million, three hundred sixty-one thousand, seven hundred sixteen".