1648931985 has 40 divisors (see below), whose sum is σ = 3084396480. Its totient is φ = 841189536.

The previous prime is 1648931969. The next prime is 1648931987. The reversal of 1648931985 is 5891398461.

It is not a de Polignac number, because 1648931985 - 2⁴ = 1648931969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1648931987) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 79195 + ... + 97824.

It is an arithmetic number, because the mean of its divisors is an integer number (77109912).

Almost surely, 2^1648931985 is an apocalyptic number.

1648931985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1648931985 is a deficient number, since it is larger than the sum of its proper divisors (1435464495).

1648931985 is a wasteful number, since it uses less digits than its factorization.

1648931985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177059 (or 177050 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 1648931985 is about 40607.0435392679. The cubic root of 1648931985 is about 1181.4107385196.

The spelling of 1648931985 in words is "one billion, six hundred forty-eight million, nine hundred thirty-one thousand, nine hundred eighty-five".