1648617851 has 16 divisors (see below), whose sum is σ = 1780838400. Its totient is φ = 1521732960.

The previous prime is 1648617847. The next prime is 1648617869. The reversal of 1648617851 is 1587168461.

It is a happy number.

It is not a de Polignac number, because 1648617851 - 2² = 1648617847 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1648617796 and 1648617805.

It is not an unprimeable number, because it can be changed into a prime (1648617811) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 262850 + ... + 269048.

It is an arithmetic number, because the mean of its divisors is an integer number (111302400).

Almost surely, 2^1648617851 is an apocalyptic number.

1648617851 is a deficient number, since it is larger than the sum of its proper divisors (132220549).

1648617851 is a wasteful number, since it uses less digits than its factorization.

1648617851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6626.

The product of its digits is 322560, while the sum is 47.

The square root of 1648617851 is about 40603.1753807507. The cubic root of 1648617851 is about 1181.3357111981.

The spelling of 1648617851 in words is "one billion, six hundred forty-eight million, six hundred seventeen thousand, eight hundred fifty-one".