265601551 has 8 divisors (see below), whose sum is σ = 280093680. Its totient is φ = 251160768.

The previous prime is 265601473. The next prime is 265601573. The reversal of 265601551 is 155106562.

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 265601551 - 2¹³ = 265593359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265601851) 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, 1966 + ... + 23131.

It is an arithmetic number, because the mean of its divisors is an integer number (35011710).

Almost surely, 2^265601551 is an apocalyptic number.

265601551 is a deficient number, since it is larger than the sum of its proper divisors (14492129).

265601551 is a wasteful number, since it uses less digits than its factorization.

265601551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25673.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 265601551 is about 16297.2866146485. The cubic root of 265601551 is about 642.8014813488.

The spelling of 265601551 in words is "two hundred sixty-five million, six hundred one thousand, five hundred fifty-one".