2195778953 has 4 divisors (see below), whose sum is σ = 2198957328. Its totient is φ = 2192600580.

The previous prime is 2195778941. The next prime is 2195778979. The reversal of 2195778953 is 3598775912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2195778953 - 2¹⁶ = 2195713417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2195778353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1588151 + ... + 1589532.

It is an arithmetic number, because the mean of its divisors is an integer number (549739332).

Almost surely, 2^2195778953 is an apocalyptic number.

It is an amenable number.

2195778953 is a deficient number, since it is larger than the sum of its proper divisors (3178375).

2195778953 is an equidigital number, since it uses as much as digits as its factorization.

2195778953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3178374.

The product of its digits is 4762800, while the sum is 56.

The square root of 2195778953 is about 46859.1394820690. The cubic root of 2195778953 is about 1299.7591176961.

The spelling of 2195778953 in words is "two billion, one hundred ninety-five million, seven hundred seventy-eight thousand, nine hundred fifty-three".