2142567778 has 8 divisors (see below), whose sum is σ = 3461071068. Its totient is φ = 988877424.

The previous prime is 2142567773. The next prime is 2142567811. The reversal of 2142567778 is 8777652412.

It can be written as a sum of positive squares in 2 ways, for example, as 1743647049 + 398920729 = 41757^2 + 19973^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2142567773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41203201 + ... + 41203252.

Almost surely, 2^2142567778 is an apocalyptic number.

2142567778 is a deficient number, since it is larger than the sum of its proper divisors (1318503290).

2142567778 is a wasteful number, since it uses less digits than its factorization.

2142567778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82406468.

The product of its digits is 1317120, while the sum is 49.

The square root of 2142567778 is about 46287.8793854288. The cubic root of 2142567778 is about 1289.1739554656.

The spelling of 2142567778 in words is "two billion, one hundred forty-two million, five hundred sixty-seven thousand, seven hundred seventy-eight".