1648779945 has 16 divisors (see below), whose sum is σ = 2702391552. Its totient is φ = 857901440.

The previous prime is 1648779941. The next prime is 1648779983. The reversal of 1648779945 is 5499778461.

It is not a de Polignac number, because 1648779945 - 2² = 1648779941 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1648779941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1339857 + ... + 1341086.

It is an arithmetic number, because the mean of its divisors is an integer number (168899472).

Almost surely, 2^1648779945 is an apocalyptic number.

1648779945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1648779945 is a deficient number, since it is larger than the sum of its proper divisors (1053611607).

1648779945 is a wasteful number, since it uses less digits than its factorization.

1648779945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2680992.

The product of its digits is 15240960, while the sum is 60.

The square root of 1648779945 is about 40605.1714071004. The cubic root of 1648779945 is about 1181.3744266904.

The spelling of 1648779945 in words is "one billion, six hundred forty-eight million, seven hundred seventy-nine thousand, nine hundred forty-five".