2155261630 has 16 divisors (see below), whose sum is σ = 3880052784. Its totient is φ = 861975360.

The previous prime is 2155261613. The next prime is 2155261631. The reversal of 2155261630 is 361625512.

It is a junction number, because it is equal to n+sod(n) for n = 2155261592 and 2155261601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155261631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82570 + ... + 105490.

It is an arithmetic number, because the mean of its divisors is an integer number (242503299).

Almost surely, 2^2155261630 is an apocalyptic number.

2155261630 is a deficient number, since it is larger than the sum of its proper divisors (1724791154).

2155261630 is a wasteful number, since it uses less digits than its factorization.

2155261630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32331.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 2155261630 is about 46424.7954222741. The cubic root of 2155261630 is about 1291.7148897062.

It can be divided in two parts, 215526 and 1630, that added together give a square (217156 = 466²).

The spelling of 2155261630 in words is "two billion, one hundred fifty-five million, two hundred sixty-one thousand, six hundred thirty".