65681331700 has 36 divisors (see below), whose sum is σ = 146004803532. Its totient is φ = 25631737600.

The previous prime is 65681331697. The next prime is 65681331713. The reversal of 65681331700 is 713318656.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 32629364496 + 33051967204 = 180636^2 + 181802^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8005819 + ... + 8014018.

It is an arithmetic number, because the mean of its divisors is an integer number (4055688987).

Almost surely, 2^65681331700 is an apocalyptic number.

It is an amenable number.

65681331700 is an abundant number, since it is smaller than the sum of its proper divisors (80323471832).

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

65681331700 is a wasteful number, since it uses less digits than its factorization.

65681331700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16019892 (or 16019885 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 65681331700 in words is "sixty-five billion, six hundred eighty-one million, three hundred thirty-one thousand, seven hundred".