66434761 has 4 divisors (see below), whose sum is σ = 66499024. Its totient is φ = 66370500.

The previous prime is 66434749. The next prime is 66434807. The reversal of 66434761 is 16743466.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16743466 = 2 ⋅8371733.

It is a cyclic number.

It is not a de Polignac number, because 66434761 - 2¹¹ = 66432713 is a prime.

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 66434761.

It is not an unprimeable number, because it can be changed into a prime (66434701) 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 3 ways as a sum of consecutive naturals, for example, 30555 + ... + 32656.

It is an arithmetic number, because the mean of its divisors is an integer number (16624756).

Almost surely, 2^66434761 is an apocalyptic number.

It is an amenable number.

66434761 is a deficient number, since it is larger than the sum of its proper divisors (64263).

66434761 is a wasteful number, since it uses less digits than its factorization.

66434761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64262.

The product of its digits is 72576, while the sum is 37.

The square root of 66434761 is about 8150.7521738794. The cubic root of 66434761 is about 405.0094211089.

The spelling of 66434761 in words is "sixty-six million, four hundred thirty-four thousand, seven hundred sixty-one".