655815550 has 24 divisors (see below), whose sum is σ = 1313650296. Its totient is φ = 242147040.

The previous prime is 655815539. The next prime is 655815551. The reversal of 655815550 is 55518556.

It is a happy number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655815551) 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 11 ways as a sum of consecutive naturals, for example, 503824 + ... + 505123.

It is an arithmetic number, because the mean of its divisors is an integer number (54735429).

Almost surely, 2^655815550 is an apocalyptic number.

655815550 is an abundant number, since it is smaller than the sum of its proper divisors (657834746).

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

655815550 is a wasteful number, since it uses less digits than its factorization.

655815550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008972 (or 1008967 counting only the distinct ones).

The product of its (nonzero) digits is 150000, while the sum is 40.

The square root of 655815550 is about 25608.8959152869. The cubic root of 655815550 is about 868.8148525676.

The spelling of 655815550 in words is "six hundred fifty-five million, eight hundred fifteen thousand, five hundred fifty".