2195661958 has 32 divisors (see below), whose sum is σ = 3909083904. Its totient is φ = 905379552.

The previous prime is 2195661947. The next prime is 2195661961. The reversal of 2195661958 is 8591665912.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13116 + ... + 67552.

It is an arithmetic number, because the mean of its divisors is an integer number (122158872).

Almost surely, 2^2195661958 is an apocalyptic number.

2195661958 is a deficient number, since it is larger than the sum of its proper divisors (1713421946).

2195661958 is a wasteful number, since it uses less digits than its factorization.

2195661958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54556.

The product of its digits is 1166400, while the sum is 52.

The square root of 2195661958 is about 46857.8910963778. The cubic root of 2195661958 is about 1299.7360327952.

The spelling of 2195661958 in words is "two billion, one hundred ninety-five million, six hundred sixty-one thousand, nine hundred fifty-eight".