655920785520 has 2160 divisors, whose sum is σ = 3090824129952. Its totient is φ = 123181793280.

The previous prime is 655920785519. The next prime is 655920785521. The reversal of 655920785520 is 25587029556.

It is a happy number.

655920785520 is a `hidden beast` number, since 6 + 559 + 2 + 0 + 7 + 85 + 5 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (655920785519) and next prime (655920785521).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655920785521) by changing a digit.

It is a polite number, since it can be written in 431 ways as a sum of consecutive naturals, for example, 4787742892 + ... + 4787743028.

Almost surely, 2^655920785520 is an apocalyptic number.

655920785520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655920785520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1545412064976).

655920785520 is an abundant number, since it is smaller than the sum of its proper divisors (2434903344432).

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

655920785520 is a wasteful number, since it uses less digits than its factorization.

655920785520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 7560000, while the sum is 54.

The spelling of 655920785520 in words is "six hundred fifty-five billion, nine hundred twenty million, seven hundred eighty-five thousand, five hundred twenty".