265455551 has 4 divisors (see below), whose sum is σ = 267936552. Its totient is φ = 262974552.

The previous prime is 265455539. The next prime is 265455559. The reversal of 265455551 is 155554562.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 265455551 - 2¹⁸ = 265193407 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 (265455559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1240340 + ... + 1240553.

It is an arithmetic number, because the mean of its divisors is an integer number (66984138).

Almost surely, 2^265455551 is an apocalyptic number.

265455551 is a deficient number, since it is larger than the sum of its proper divisors (2481001).

265455551 is a wasteful number, since it uses less digits than its factorization.

265455551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481000.

The product of its digits is 150000, while the sum is 38.

The square root of 265455551 is about 16292.8067256688. The cubic root of 265455551 is about 642.6836780487.

The spelling of 265455551 in words is "two hundred sixty-five million, four hundred fifty-five thousand, five hundred fifty-one".