255553661 has 8 divisors (see below), whose sum is σ = 281344800. Its totient is φ = 230189040.

The previous prime is 255553657. The next prime is 255553663. The reversal of 255553661 is 166355552.

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 255553661 - 2² = 255553657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255553663) 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, 105371 + ... + 107768.

It is an arithmetic number, because the mean of its divisors is an integer number (35168100).

Almost surely, 2^255553661 is an apocalyptic number.

It is an amenable number.

255553661 is a deficient number, since it is larger than the sum of its proper divisors (25791139).

255553661 is a wasteful number, since it uses less digits than its factorization.

255553661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213259.

The product of its digits is 135000, while the sum is 38.

The square root of 255553661 is about 15986.0458212780. The cubic root of 255553661 is about 634.5911858040.

The spelling of 255553661 in words is "two hundred fifty-five million, five hundred fifty-three thousand, six hundred sixty-one".