2145776542 has 24 divisors (see below), whose sum is σ = 4032175896. Its totient is φ = 848878128.

The previous prime is 2145776537. The next prime is 2145776543. The reversal of 2145776542 is 2456775412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145776543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 840868 + ... + 843415.

It is an arithmetic number, because the mean of its divisors is an integer number (168007329).

Almost surely, 2^2145776542 is an apocalyptic number.

2145776542 is a deficient number, since it is larger than the sum of its proper divisors (1886399354).

2145776542 is a wasteful number, since it uses less digits than its factorization.

2145776542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684312 (or 1684305 counting only the distinct ones).

The product of its digits is 470400, while the sum is 43.

The square root of 2145776542 is about 46322.5273706001. The cubic root of 2145776542 is about 1289.8172010272.

The spelling of 2145776542 in words is "two billion, one hundred forty-five million, seven hundred seventy-six thousand, five hundred forty-two".