65681768220 has 96 divisors (see below), whose sum is σ = 184689868608. Its totient is φ = 17440929792.

The previous prime is 65681768209. The next prime is 65681768281. The reversal of 65681768220 is 2286718656.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16124104 + ... + 16128176.

It is an arithmetic number, because the mean of its divisors is an integer number (1923852798).

Almost surely, 2^65681768220 is an apocalyptic number.

65681768220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65681768220 is an abundant number, since it is smaller than the sum of its proper divisors (119008100388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65681768220 is a wasteful number, since it uses less digits than its factorization.

65681768220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5159 (or 5157 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 51.

The spelling of 65681768220 in words is "sixty-five billion, six hundred eighty-one million, seven hundred sixty-eight thousand, two hundred twenty".