2156520518 has 24 divisors (see below), whose sum is σ = 3361503600. Its totient is φ = 1037545200.

The previous prime is 2156520517. The next prime is 2156520529. The reversal of 2156520518 is 8150256512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156520517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 344783 + ... + 350981.

It is an arithmetic number, because the mean of its divisors is an integer number (140062650).

Almost surely, 2^2156520518 is an apocalyptic number.

2156520518 is a deficient number, since it is larger than the sum of its proper divisors (1204983082).

2156520518 is a wasteful number, since it uses less digits than its factorization.

2156520518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6444 (or 6413 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 35.

The square root of 2156520518 is about 46438.3518010706. The cubic root of 2156520518 is about 1291.9663375811.

The spelling of 2156520518 in words is "two billion, one hundred fifty-six million, five hundred twenty thousand, five hundred eighteen".