143665642 has 4 divisors (see below), whose sum is σ = 215498466. Its totient is φ = 71832820.

The previous prime is 143665619. The next prime is 143665663. The reversal of 143665642 is 246566341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 246566341 = 7 ⋅35223763.

It can be written as a sum of positive squares in only one way, i.e., 112763161 + 30902481 = 10619^2 + 5559^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35916409 + ... + 35916412.

Almost surely, 2^143665642 is an apocalyptic number.

143665642 is a deficient number, since it is larger than the sum of its proper divisors (71832824).

143665642 is an equidigital number, since it uses as much as digits as its factorization.

143665642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71832823.

The product of its digits is 103680, while the sum is 37.

The square root of 143665642 is about 11986.0603202220. The cubic root of 143665642 is about 523.7422858155.

The spelling of 143665642 in words is "one hundred forty-three million, six hundred sixty-five thousand, six hundred forty-two".