65640656266 has 8 divisors (see below), whose sum is σ = 98463176064. Its totient is φ = 32819597580.

The previous prime is 65640656261. The next prime is 65640656273. The reversal of 65640656266 is 66265604656.

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

It is not an unprimeable number, because it can be changed into a prime (65640656261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245050 + ... + 437413.

It is an arithmetic number, because the mean of its divisors is an integer number (12307897008).

Almost surely, 2^65640656266 is an apocalyptic number.

65640656266 is a deficient number, since it is larger than the sum of its proper divisors (32822519798).

65640656266 is a wasteful number, since it uses less digits than its factorization.

65640656266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730556.

The product of its (nonzero) digits is 9331200, while the sum is 52.

The spelling of 65640656266 in words is "sixty-five billion, six hundred forty million, six hundred fifty-six thousand, two hundred sixty-six".