265549979 has 4 divisors (see below), whose sum is σ = 281170584. Its totient is φ = 249929376.

The previous prime is 265549967. The next prime is 265549993. The reversal of 265549979 is 979945562.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 979945562 = 2 ⋅489972781.

It is not a de Polignac number, because 265549979 - 2¹² = 265545883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265549939) 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, 7810277 + ... + 7810310.

It is an arithmetic number, because the mean of its divisors is an integer number (70292646).

Almost surely, 2^265549979 is an apocalyptic number.

265549979 is a deficient number, since it is larger than the sum of its proper divisors (15620605).

265549979 is a wasteful number, since it uses less digits than its factorization.

265549979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15620604.

The product of its digits is 6123600, while the sum is 56.

The square root of 265549979 is about 16295.7043112595. The cubic root of 265549979 is about 642.7598742828.

The spelling of 265549979 in words is "two hundred sixty-five million, five hundred forty-nine thousand, nine hundred seventy-nine".