253742666 has 4 divisors (see below), whose sum is σ = 380614002. Its totient is φ = 126871332.

The previous prime is 253742659. The next prime is 253742669. The reversal of 253742666 is 666247352.

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

It can be written as a sum of positive squares in only one way, i.e., 202920025 + 50822641 = 14245^2 + 7129^2 .

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 as a sum of consecutive naturals, namely, 63435665 + ... + 63435668.

Almost surely, 2^253742666 is an apocalyptic number.

253742666 is a deficient number, since it is larger than the sum of its proper divisors (126871336).

253742666 is a wasteful number, since it uses less digits than its factorization.

253742666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126871335.

The product of its digits is 362880, while the sum is 41.

The square root of 253742666 is about 15929.3021190509. The cubic root of 253742666 is about 633.0886091118.

The spelling of 253742666 in words is "two hundred fifty-three million, seven hundred forty-two thousand, six hundred sixty-six".