2155557306 has 64 divisors (see below), whose sum is σ = 4972769280. Its totient is φ = 610182720.

The previous prime is 2155557293. The next prime is 2155557307. The reversal of 2155557306 is 6037555512.

It is not an unprimeable number, because it can be changed into a prime (2155557307) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2606065 + ... + 2606891.

It is an arithmetic number, because the mean of its divisors is an integer number (77699520).

Almost surely, 2^2155557306 is an apocalyptic number.

2155557306 is an abundant number, since it is smaller than the sum of its proper divisors (2817211974).

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

2155557306 is a wasteful number, since it uses less digits than its factorization.

2155557306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339.

The product of its (nonzero) digits is 157500, while the sum is 39.

The square root of 2155557306 is about 46427.9797751313. The cubic root of 2155557306 is about 1291.7739562594.

The spelling of 2155557306 in words is "two billion, one hundred fifty-five million, five hundred fifty-seven thousand, three hundred six".