641657225 has 24 divisors (see below), whose sum is σ = 879904992. Its totient is φ = 460252800.

The previous prime is 641657201. The next prime is 641657239. The reversal of 641657225 is 522756146.

It is not a de Polignac number, because 641657225 - 2⁸ = 641656969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4094 + ... + 36056.

It is an arithmetic number, because the mean of its divisors is an integer number (36662708).

Almost surely, 2^641657225 is an apocalyptic number.

It is an amenable number.

641657225 is a deficient number, since it is larger than the sum of its proper divisors (238247767).

641657225 is a wasteful number, since it uses less digits than its factorization.

641657225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32057 (or 32052 counting only the distinct ones).

The product of its digits is 100800, while the sum is 38.

The square root of 641657225 is about 25330.9538904479. The cubic root of 641657225 is about 862.5170647047.

The spelling of 641657225 in words is "six hundred forty-one million, six hundred fifty-seven thousand, two hundred twenty-five".