1641656225 has 12 divisors (see below), whose sum is σ = 2220713520. Its totient is φ = 1193931600.

The previous prime is 1641656209. The next prime is 1641656251. The reversal of 1641656225 is 5226561461.

It is not a de Polignac number, because 1641656225 - 2⁴ = 1641656209 is a prime.

It is a super-2 number, since 2×1641656225² = 5390070322162501250, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2984555 + ... + 2985104.

It is an arithmetic number, because the mean of its divisors is an integer number (185059460).

Almost surely, 2^1641656225 is an apocalyptic number.

It is an amenable number.

1641656225 is a deficient number, since it is larger than the sum of its proper divisors (579057295).

1641656225 is a wasteful number, since it uses less digits than its factorization.

1641656225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5969680 (or 5969675 counting only the distinct ones).

The product of its digits is 86400, while the sum is 38.

The square root of 1641656225 is about 40517.3570831070. The cubic root of 1641656225 is about 1179.6705546358.

The spelling of 1641656225 in words is "one billion, six hundred forty-one million, six hundred fifty-six thousand, two hundred twenty-five".