2155443642 has 64 divisors (see below), whose sum is σ = 5230972800. Its totient is φ = 652458240.

The previous prime is 2155443629. The next prime is 2155443649. The reversal of 2155443642 is 2463445512.

2155443642 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 4 + 4 + 3 + 642 = 666.

2155443642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2155443597 and 2155443606.

It is not an unprimeable number, because it can be changed into a prime (2155443649) 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, 883248 + ... + 885684.

It is an arithmetic number, because the mean of its divisors is an integer number (81733950).

Almost surely, 2^2155443642 is an apocalyptic number.

2155443642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2155443642 is an abundant number, since it is smaller than the sum of its proper divisors (3075529158).

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

2155443642 is a wasteful number, since it uses less digits than its factorization.

2155443642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3948 (or 3942 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

The square root of 2155443642 is about 46426.7556695490. The cubic root of 2155443642 is about 1291.7512504878.

The spelling of 2155443642 in words is "two billion, one hundred fifty-five million, four hundred forty-three thousand, six hundred forty-two".