655406550 has 72 divisors (see below), whose sum is σ = 1765265736. Its totient is φ = 174337920.

The previous prime is 655406519. The next prime is 655406581. The reversal of 655406550 is 55604556.

It is a happy number.

655406550 is a `hidden beast` number, since 6 + 5 + 540 + 65 + 50 = 666.

655406550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (655406519) and next prime (655406581).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 204057 + ... + 207243.

Almost surely, 2^655406550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655406550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (882632868).

655406550 is an abundant number, since it is smaller than the sum of its proper divisors (1109859186).

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

655406550 is a wasteful number, since it uses less digits than its factorization.

655406550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3662 (or 3654 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The square root of 655406550 is about 25600.9091635434. The cubic root of 655406550 is about 868.6342026015.

The spelling of 655406550 in words is "six hundred fifty-five million, four hundred six thousand, five hundred fifty".