1648758865 has 32 divisors (see below), whose sum is σ = 2153956896. Its totient is φ = 1204346880.

The previous prime is 1648758863. The next prime is 1648758899. The reversal of 1648758865 is 5688578461.

It can be written as a sum of positive squares in 16 ways, for example, as 1105496001 + 543262864 = 33249^2 + 23308^2 .

It is not a de Polignac number, because 1648758865 - 2¹ = 1648758863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1648758863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4152847 + ... + 4153243.

It is an arithmetic number, because the mean of its divisors is an integer number (67311153).

Almost surely, 2^1648758865 is an apocalyptic number.

It is an amenable number.

1648758865 is a deficient number, since it is larger than the sum of its proper divisors (505198031).

1648758865 is a wasteful number, since it uses less digits than its factorization.

1648758865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949.

The product of its digits is 12902400, while the sum is 58.

The square root of 1648758865 is about 40604.9118334223. The cubic root of 1648758865 is about 1181.3693919617.

The spelling of 1648758865 in words is "one billion, six hundred forty-eight million, seven hundred fifty-eight thousand, eight hundred sixty-five".