255707661 has 8 divisors (see below), whose sum is σ = 371938464. Its totient is φ = 154974320.

The previous prime is 255707657. The next prime is 255707663. The reversal of 255707661 is 166707552.

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 255707661 - 2² = 255707657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255707663) 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, 3874326 + ... + 3874391.

It is an arithmetic number, because the mean of its divisors is an integer number (46492308).

Almost surely, 2^255707661 is an apocalyptic number.

It is an amenable number.

255707661 is a deficient number, since it is larger than the sum of its proper divisors (116230803).

255707661 is a wasteful number, since it uses less digits than its factorization.

255707661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7748731.

The product of its (nonzero) digits is 88200, while the sum is 39.

The square root of 255707661 is about 15990.8617966637. The cubic root of 255707661 is about 634.7186312080.

The spelling of 255707661 in words is "two hundred fifty-five million, seven hundred seven thousand, six hundred sixty-one".