1648644377 has 16 divisors (see below), whose sum is σ = 1777064832. Its totient is φ = 1523800320.

The previous prime is 1648644281. The next prime is 1648644379. The reversal of 1648644377 is 7734468461.

It is a cyclic number.

It is not a de Polignac number, because 1648644377 - 2²⁰ = 1647595801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1648644379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1205348 + ... + 1206714.

It is an arithmetic number, because the mean of its divisors is an integer number (111066552).

Almost surely, 2^1648644377 is an apocalyptic number.

1648644377 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1648644377 is a deficient number, since it is larger than the sum of its proper divisors (128420455).

1648644377 is a wasteful number, since it uses less digits than its factorization.

1648644377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2608.

The product of its digits is 2709504, while the sum is 50.

The square root of 1648644377 is about 40603.5020287659. The cubic root of 1648644377 is about 1181.3420469989.

The spelling of 1648644377 in words is "one billion, six hundred forty-eight million, six hundred forty-four thousand, three hundred seventy-seven".