2051515550 has 48 divisors (see below), whose sum is σ = 4434894720. Its totient is φ = 691448160.

The previous prime is 2051515541. The next prime is 2051515553. The reversal of 2051515550 is 555151502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051515553) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 29024 + ... + 70323.

It is an arithmetic number, because the mean of its divisors is an integer number (92393640).

Almost surely, 2^2051515550 is an apocalyptic number.

2051515550 is an abundant number, since it is smaller than the sum of its proper divisors (2383379170).

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

2051515550 is a wasteful number, since it uses less digits than its factorization.

2051515550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99425 (or 99420 counting only the distinct ones).

The product of its (nonzero) digits is 6250, while the sum is 29.

The square root of 2051515550 is about 45293.6590484805. The cubic root of 2051515550 is about 1270.6470652256.

The spelling of 2051515550 in words is "two billion, fifty-one million, five hundred fifteen thousand, five hundred fifty".