253665111 has 24 divisors (see below), whose sum is σ = 395522544. Its totient is φ = 144184320.

The previous prime is 253665107. The next prime is 253665121. The reversal of 253665111 is 111566352.

It is not a de Polignac number, because 253665111 - 2² = 253665107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253665121) 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 23 ways as a sum of consecutive naturals, for example, 23901 + ... + 32841.

It is an arithmetic number, because the mean of its divisors is an integer number (16480106).

Almost surely, 2^253665111 is an apocalyptic number.

253665111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

253665111 is a deficient number, since it is larger than the sum of its proper divisors (141857433).

253665111 is a wasteful number, since it uses less digits than its factorization.

253665111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9151 (or 9144 counting only the distinct ones).

The product of its digits is 5400, while the sum is 30.

The square root of 253665111 is about 15926.8675827986. The cubic root of 253665111 is about 633.0241025640.

The spelling of 253665111 in words is "two hundred fifty-three million, six hundred sixty-five thousand, one hundred eleven".