253742665 has 16 divisors (see below), whose sum is σ = 334382976. Its totient is φ = 183312000.

The previous prime is 253742659. The next prime is 253742669. The reversal of 253742665 is 566247352.

It is a de Polignac number, because none of the positive numbers 2^k-253742665 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253742669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6972 + ... + 23581.

It is an arithmetic number, because the mean of its divisors is an integer number (20898936).

Almost surely, 2^253742665 is an apocalyptic number.

It is an amenable number.

253742665 is a deficient number, since it is larger than the sum of its proper divisors (80640311).

253742665 is a wasteful number, since it uses less digits than its factorization.

253742665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30720.

The product of its digits is 302400, while the sum is 40.

The square root of 253742665 is about 15929.3020876622. The cubic root of 253742665 is about 633.0886082801.

The spelling of 253742665 in words is "two hundred fifty-three million, seven hundred forty-two thousand, six hundred sixty-five".