2195651772 has 54 divisors (see below), whose sum is σ = 5763361968. Its totient is φ = 731875176.

The previous prime is 2195651747. The next prime is 2195651789. The reversal of 2195651772 is 2771565912.

2195651772 is a `hidden beast` number, since 2 + 1 + 9 + 565 + 17 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (54).

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 17 ways as a sum of consecutive naturals, for example, 15588 + ... + 68075.

Almost surely, 2^2195651772 is an apocalyptic number.

It is an amenable number.

2195651772 is an abundant number, since it is smaller than the sum of its proper divisors (3567710196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2195651772 is an frugal number, since it uses more digits than its factorization.

2195651772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83691 (or 83668 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The square root of 2195651772 is about 46857.7824059142. The cubic root of 2195651772 is about 1299.7340229029.

The spelling of 2195651772 in words is "two billion, one hundred ninety-five million, six hundred fifty-one thousand, seven hundred seventy-two".