655207561 has 8 divisors (see below), whose sum is σ = 668979360. Its totient is φ = 641575872.

The previous prime is 655207559. The next prime is 655207603. The reversal of 655207561 is 165702556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 655207561 - 2¹ = 655207559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 655207561.

It is not an unprimeable number, because it can be changed into a prime (655207541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25551 + ... + 44308.

It is an arithmetic number, because the mean of its divisors is an integer number (83622420).

Almost surely, 2^655207561 is an apocalyptic number.

It is an amenable number.

655207561 is a deficient number, since it is larger than the sum of its proper divisors (13771799).

655207561 is a wasteful number, since it uses less digits than its factorization.

655207561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70055.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 655207561 is about 25597.0225026271. The cubic root of 655207561 is about 868.5462845770.

The spelling of 655207561 in words is "six hundred fifty-five million, two hundred seven thousand, five hundred sixty-one".