2155640630 has 192 divisors, whose sum is σ = 5122828800. Its totient is φ = 643368960.

The previous prime is 2155640629. The next prime is 2155640633. The reversal of 2155640630 is 360465512.

2155640630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155640633) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6004391 + ... + 6004749.

It is an arithmetic number, because the mean of its divisors is an integer number (26681400).

Almost surely, 2^2155640630 is an apocalyptic number.

2155640630 is an abundant number, since it is smaller than the sum of its proper divisors (2967188170).

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

2155640630 is a wasteful number, since it uses less digits than its factorization.

2155640630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 2155640630 is about 46428.8771132794. The cubic root of 2155640630 is about 1291.7906007386.

The spelling of 2155640630 in words is "two billion, one hundred fifty-five million, six hundred forty thousand, six hundred thirty".