1648680725 has 24 divisors (see below), whose sum is σ = 2125572288. Its totient is φ = 1267516800.

The previous prime is 1648680721. The next prime is 1648680731. The reversal of 1648680725 is 5270868461.

It is not a de Polignac number, because 1648680725 - 2² = 1648680721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1648680725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1648680721) 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, 56672 + ... + 80678.

It is an arithmetic number, because the mean of its divisors is an integer number (88565512).

Almost surely, 2^1648680725 is an apocalyptic number.

It is an amenable number.

1648680725 is a deficient number, since it is larger than the sum of its proper divisors (476891563).

1648680725 is a wasteful number, since it uses less digits than its factorization.

1648680725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24125 (or 24120 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 47.

The square root of 1648680725 is about 40603.9496231586. The cubic root of 1648680725 is about 1181.3507286984.

The spelling of 1648680725 in words is "one billion, six hundred forty-eight million, six hundred eighty thousand, seven hundred twenty-five".