66371761 has 4 divisors (see below), whose sum is σ = 66407152. Its totient is φ = 66336372.

The previous prime is 66371759. The next prime is 66371777. The reversal of 66371761 is 16717366.

66371761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66371761 - 2¹ = 66371759 is a prime.

It is a super-2 number, since 2×66371761² = 8810421316482242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66371761.

It is not an unprimeable number, because it can be changed into a prime (66377761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14715 + ... + 18688.

It is an arithmetic number, because the mean of its divisors is an integer number (16601788).

Almost surely, 2^66371761 is an apocalyptic number.

It is an amenable number.

66371761 is a deficient number, since it is larger than the sum of its proper divisors (35391).

66371761 is a wasteful number, since it uses less digits than its factorization.

66371761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35390.

The product of its digits is 31752, while the sum is 37.

The square root of 66371761 is about 8146.8865832292. The cubic root of 66371761 is about 404.8813573118.

The spelling of 66371761 in words is "sixty-six million, three hundred seventy-one thousand, seven hundred sixty-one".