648121825 has 24 divisors (see below), whose sum is σ = 911052800. Its totient is φ = 453418560.

The previous prime is 648121819. The next prime is 648121829. The reversal of 648121825 is 528121846.

It is a de Polignac number, because none of the positive numbers 2^k-648121825 is a prime.

It is not an unprimeable number, because it can be changed into a prime (648121829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46305 + ... + 58654.

Almost surely, 2^648121825 is an apocalyptic number.

648121825 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

648121825 is a deficient number, since it is larger than the sum of its proper divisors (262930975).

648121825 is a wasteful number, since it uses less digits than its factorization.

648121825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105001 (or 104996 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 648121825 is about 25458.2368792499. The cubic root of 648121825 is about 865.4039678154.

The spelling of 648121825 in words is "six hundred forty-eight million, one hundred twenty-one thousand, eight hundred twenty-five".