2180661826 has 16 divisors (see below), whose sum is σ = 3738885696. Its totient is φ = 934417296.

The previous prime is 2180661823. The next prime is 2180661851. The reversal of 2180661826 is 6281660812.

It is not an unprimeable number, because it can be changed into a prime (2180661823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139245 + ... + 154111.

It is an arithmetic number, because the mean of its divisors is an integer number (233680356).

Almost surely, 2^2180661826 is an apocalyptic number.

2180661826 is a deficient number, since it is larger than the sum of its proper divisors (1558223870).

2180661826 is a wasteful number, since it uses less digits than its factorization.

2180661826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25353.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 2180661826 is about 46697.5569596526. The cubic root of 2180661826 is about 1296.7694591277.

The spelling of 2180661826 in words is "two billion, one hundred eighty million, six hundred sixty-one thousand, eight hundred twenty-six".