2158775540 has 12 divisors (see below), whose sum is σ = 4533428676. Its totient is φ = 863510208.

The previous prime is 2158775537. The next prime is 2158775599. The reversal of 2158775540 is 455778512.

It can be written as a sum of positive squares in 2 ways, for example, as 982697104 + 1176078436 = 31348^2 + 34294^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2158775491 and 2158775500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53969369 + ... + 53969408.

It is an arithmetic number, because the mean of its divisors is an integer number (377785723).

Almost surely, 2^2158775540 is an apocalyptic number.

2158775540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2158775540 is an abundant number, since it is smaller than the sum of its proper divisors (2374653136).

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

2158775540 is a wasteful number, since it uses less digits than its factorization.

2158775540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107938786 (or 107938784 counting only the distinct ones).

The product of its (nonzero) digits is 392000, while the sum is 44.

The square root of 2158775540 is about 46462.6251948811. The cubic root of 2158775540 is about 1292.4165068212.

The spelling of 2158775540 in words is "two billion, one hundred fifty-eight million, seven hundred seventy-five thousand, five hundred forty".