2156604225 has 12 divisors (see below), whose sum is σ = 3565585776. Its totient is φ = 1150188880.

The previous prime is 2156604221. The next prime is 2156604251. The reversal of 2156604225 is 5224066512.

It is not a de Polignac number, because 2156604225 - 2² = 2156604221 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2156604221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14377287 + ... + 14377436.

It is an arithmetic number, because the mean of its divisors is an integer number (297132148).

Almost surely, 2^2156604225 is an apocalyptic number.

2156604225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2156604225 is a deficient number, since it is larger than the sum of its proper divisors (1408981551).

2156604225 is a wasteful number, since it uses less digits than its factorization.

2156604225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28754736 (or 28754731 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 2156604225 is about 46439.2530624686. The cubic root of 2156604225 is about 1291.9830535867.

The spelling of 2156604225 in words is "two billion, one hundred fifty-six million, six hundred four thousand, two hundred twenty-five".