2155512942 has 96 divisors (see below), whose sum is σ = 5332594176. Its totient is φ = 622881600.

The previous prime is 2155512941. The next prime is 2155512971. The reversal of 2155512942 is 2492155512.

2155512942 is a `hidden beast` number, since 2 + 1 + 55 + 512 + 94 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 2155512897 and 2155512906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155512941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2290192 + ... + 2291132.

It is an arithmetic number, because the mean of its divisors is an integer number (55547856).

Almost surely, 2^2155512942 is an apocalyptic number.

2155512942 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155512942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2666297088).

2155512942 is an abundant number, since it is smaller than the sum of its proper divisors (3177081234).

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

2155512942 is a wasteful number, since it uses less digits than its factorization.

2155512942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486 (or 1483 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 2155512942 is about 46427.5020004307. The cubic root of 2155512942 is about 1291.7650941038.

The spelling of 2155512942 in words is "two billion, one hundred fifty-five million, five hundred twelve thousand, nine hundred forty-two".