655909685720 has 16 divisors (see below), whose sum is σ = 1475796792960. Its totient is φ = 262363874272.

The previous prime is 655909685699. The next prime is 655909685723. The reversal of 655909685720 is 27586909556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655909685723) 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, 8198871032 + ... + 8198871111.

It is an arithmetic number, because the mean of its divisors is an integer number (92237299560).

Almost surely, 2^655909685720 is an apocalyptic number.

It is an amenable number.

655909685720 is an abundant number, since it is smaller than the sum of its proper divisors (819887107240).

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

655909685720 is a wasteful number, since it uses less digits than its factorization.

655909685720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16397742154 (or 16397742150 counting only the distinct ones).

The product of its (nonzero) digits is 40824000, while the sum is 62.

The spelling of 655909685720 in words is "six hundred fifty-five billion, nine hundred nine million, six hundred eighty-five thousand, seven hundred twenty".