66254765 has 4 divisors (see below), whose sum is σ = 79505724. Its totient is φ = 53003808.

The previous prime is 66254761. The next prime is 66254803. The reversal of 66254765 is 56745266.

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 45333289 + 20921476 = 6733^2 + 4574^2 .

It is a cyclic number.

It is not a de Polignac number, because 66254765 - 2² = 66254761 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66254761) 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, 6625472 + ... + 6625481.

It is an arithmetic number, because the mean of its divisors is an integer number (19876431).

Almost surely, 2^66254765 is an apocalyptic number.

It is an amenable number.

66254765 is a deficient number, since it is larger than the sum of its proper divisors (13250959).

66254765 is a wasteful number, since it uses less digits than its factorization.

66254765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13250958.

The product of its digits is 302400, while the sum is 41.

The square root of 66254765 is about 8139.7030044099. The cubic root of 66254765 is about 404.6433175231.

The spelling of 66254765 in words is "sixty-six million, two hundred fifty-four thousand, seven hundred sixty-five".