66252761 has 4 divisors (see below), whose sum is σ = 67868724. Its totient is φ = 64636800.

The previous prime is 66252731. The next prime is 66252773. The reversal of 66252761 is 16725266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33408400 + 32844361 = 5780^2 + 5731^2 .

It is a cyclic number.

It is not a de Polignac number, because 66252761 - 2²² = 62058457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66252731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 807920 + ... + 808001.

It is an arithmetic number, because the mean of its divisors is an integer number (16967181).

Almost surely, 2^66252761 is an apocalyptic number.

It is an amenable number.

66252761 is a deficient number, since it is larger than the sum of its proper divisors (1615963).

66252761 is a wasteful number, since it uses less digits than its factorization.

66252761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615962.

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

The square root of 66252761 is about 8139.5799031645. The cubic root of 66252761 is about 404.6392377492.

The spelling of 66252761 in words is "sixty-six million, two hundred fifty-two thousand, seven hundred sixty-one".