66256765 has 16 divisors (see below), whose sum is σ = 83990016. Its totient is φ = 50097600.

The previous prime is 66256741. The next prime is 66256777. The reversal of 66256765 is 56765266.

It is not a de Polignac number, because 66256765 - 2⁵ = 66256733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1695 + ... + 11635.

It is an arithmetic number, because the mean of its divisors is an integer number (5249376).

Almost surely, 2^66256765 is an apocalyptic number.

It is an amenable number.

66256765 is a deficient number, since it is larger than the sum of its proper divisors (17733251).

66256765 is a wasteful number, since it uses less digits than its factorization.

66256765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10020.

The product of its digits is 453600, while the sum is 43.

The square root of 66256765 is about 8139.8258580881. The cubic root of 66256765 is about 404.6473890717.

The spelling of 66256765 in words is "sixty-six million, two hundred fifty-six thousand, seven hundred sixty-five".