1645941646 has 16 divisors (see below), whose sum is σ = 2488560480. Its totient is φ = 816441120.

The previous prime is 1645941643. The next prime is 1645941653. The reversal of 1645941646 is 6461495461.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 1645941596 and 1645941605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645941643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176140 + ... + 185248.

It is an arithmetic number, because the mean of its divisors is an integer number (155535030).

Almost surely, 2^1645941646 is an apocalyptic number.

1645941646 is a deficient number, since it is larger than the sum of its proper divisors (842618834).

1645941646 is a wasteful number, since it uses less digits than its factorization.

1645941646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9819.

The product of its digits is 622080, while the sum is 46.

The square root of 1645941646 is about 40570.2063835027. The cubic root of 1645941646 is about 1180.6961433792.

The spelling of 1645941646 in words is "one billion, six hundred forty-five million, nine hundred forty-one thousand, six hundred forty-six".