655551607 has 16 divisors (see below), whose sum is σ = 687140320. Its totient is φ = 624817152.

The previous prime is 655551601. The next prime is 655551619. The reversal of 655551607 is 706155556.

It is a 10-Lehmer number, since φ(655551607) divides (655551607-1)¹⁰.

It is a cyclic number.

It is not a de Polignac number, because 655551607 - 2³ = 655551599 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 655551607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655551601) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 439519 + ... + 441007.

It is an arithmetic number, because the mean of its divisors is an integer number (42946270).

Almost surely, 2^655551607 is an apocalyptic number.

655551607 is a deficient number, since it is larger than the sum of its proper divisors (31588713).

655551607 is a wasteful number, since it uses less digits than its factorization.

655551607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762.

The product of its (nonzero) digits is 157500, while the sum is 40.

The square root of 655551607 is about 25603.7420507238. The cubic root of 655551607 is about 868.6982809851.

The spelling of 655551607 in words is "six hundred fifty-five million, five hundred fifty-one thousand, six hundred seven".