1646674965 has 24 divisors (see below), whose sum is σ = 3073794360. Its totient is φ = 810670464.

The previous prime is 1646674963. The next prime is 1646674969. The reversal of 1646674965 is 5694766461.

It can be written as a sum of positive squares in 4 ways, for example, as 363817476 + 1282857489 = 19074^2 + 35817^2 .

It is not a de Polignac number, because 1646674965 - 2¹ = 1646674963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646674963) 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 23 ways as a sum of consecutive naturals, for example, 1406830 + ... + 1407999.

It is an arithmetic number, because the mean of its divisors is an integer number (128074765).

Almost surely, 2^1646674965 is an apocalyptic number.

1646674965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1646674965 is a deficient number, since it is larger than the sum of its proper divisors (1427119395).

1646674965 is a wasteful number, since it uses less digits than its factorization.

1646674965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2814853 (or 2814850 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The square root of 1646674965 is about 40579.2430313824. The cubic root of 1646674965 is about 1180.8714631553.

The spelling of 1646674965 in words is "one billion, six hundred forty-six million, six hundred seventy-four thousand, nine hundred sixty-five".