2125771818 has 8 divisors (see below), whose sum is σ = 4251543648. Its totient is φ = 708590604.

The previous prime is 2125771799. The next prime is 2125771861. The reversal of 2125771818 is 8181775212.

It is a happy number.

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

2125771818 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 2125771818.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 177147646 + ... + 177147657.

It is an arithmetic number, because the mean of its divisors is an integer number (531442956).

Almost surely, 2^2125771818 is an apocalyptic number.

2125771818 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2125771818 is a wasteful number, since it uses less digits than its factorization.

2125771818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354295308.

The product of its digits is 62720, while the sum is 42.

The square root of 2125771818 is about 46106.0930680534. The cubic root of 2125771818 is about 1285.7964283639.

The spelling of 2125771818 in words is "two billion, one hundred twenty-five million, seven hundred seventy-one thousand, eight hundred eighteen".