2155869646 has 8 divisors (see below), whose sum is σ = 3695776560. Its totient is φ = 923944128.

The previous prime is 2155869613. The next prime is 2155869659. The reversal of 2155869646 is 6469685512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 2155869593 and 2155869602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76995331 + ... + 76995358.

It is an arithmetic number, because the mean of its divisors is an integer number (461972070).

Almost surely, 2^2155869646 is an apocalyptic number.

2155869646 is a deficient number, since it is larger than the sum of its proper divisors (1539906914).

2155869646 is a wasteful number, since it uses less digits than its factorization.

2155869646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153990698.

The product of its digits is 3110400, while the sum is 52.

The square root of 2155869646 is about 46431.3433576932. The cubic root of 2155869646 is about 1291.8363458775.

It can be divided in two parts, 21558 and 69646, that added together give a square (91204 = 302²).

The spelling of 2155869646 in words is "two billion, one hundred fifty-five million, eight hundred sixty-nine thousand, six hundred forty-six".