66450761 has 8 divisors (see below), whose sum is σ = 71629320. Its totient is φ = 61281792.

The previous prime is 66450751. The next prime is 66450793. The reversal of 66450761 is 16705466.

It can be written as a sum of positive squares in 4 ways, for example, as 11971600 + 54479161 = 3460^2 + 7381^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-66450761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66450731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19385 + ... + 22553.

It is an arithmetic number, because the mean of its divisors is an integer number (8953665).

Almost surely, 2^66450761 is an apocalyptic number.

It is an amenable number.

66450761 is a deficient number, since it is larger than the sum of its proper divisors (5178559).

66450761 is a wasteful number, since it uses less digits than its factorization.

66450761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4795.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 66450761 is about 8151.7336192984. The cubic root of 66450761 is about 405.0419323550.

The spelling of 66450761 in words is "sixty-six million, four hundred fifty thousand, seven hundred sixty-one".