2143825778 has 4 divisors (see below), whose sum is σ = 3215738670. Its totient is φ = 1071912888.

The previous prime is 2143825757. The next prime is 2143825787. The reversal of 2143825778 is 8775283412.

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., 1757034889 + 386790889 = 41917^2 + 19667^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 535956443 + ... + 535956446.

Almost surely, 2^2143825778 is an apocalyptic number.

2143825778 is a deficient number, since it is larger than the sum of its proper divisors (1071912892).

2143825778 is a wasteful number, since it uses less digits than its factorization.

2143825778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071912891.

The product of its digits is 752640, while the sum is 47.

The square root of 2143825778 is about 46301.4662618799. The cubic root of 2143825778 is about 1289.4262171908.

The spelling of 2143825778 in words is "two billion, one hundred forty-three million, eight hundred twenty-five thousand, seven hundred seventy-eight".