655605506556 has 432 divisors, whose sum is σ = 2298042673920. Its totient is φ = 156957989760.

The previous prime is 655605506531. The next prime is 655605506581.

655605506556 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (655605506531) and next prime (655605506581).

It is a super-2 number, since 2×655605506556² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 959890591 + ... + 959891273.

Almost surely, 2^655605506556 is an apocalyptic number.

655605506556 is a gapful number since it is divisible by the number (66) 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 655605506556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1149021336960).

655605506556 is an abundant number, since it is smaller than the sum of its proper divisors (1642437167364).

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

655605506556 is a wasteful number, since it uses less digits than its factorization.

655605506556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423 (or 719 counting only the distinct ones).

The product of its (nonzero) digits is 20250000, while the sum is 54.

The spelling of 655605506556 in words is "six hundred fifty-five billion, six hundred five million, five hundred six thousand, five hundred fifty-six".