1641563684 has 12 divisors (see below), whose sum is σ = 2878383900. Its totient is φ = 819168288.

The previous prime is 1641563683. The next prime is 1641563687. The reversal of 1641563684 is 4863651461.

It can be written as a sum of positive squares in 2 ways, for example, as 828173284 + 813390400 = 28778^2 + 28520^2 .

It is not an unprimeable number, because it can be changed into a prime (1641563683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401099 + ... + 405170.

It is an arithmetic number, because the mean of its divisors is an integer number (239865325).

Almost surely, 2^1641563684 is an apocalyptic number.

It is an amenable number.

1641563684 is a deficient number, since it is larger than the sum of its proper divisors (1236820216).

1641563684 is a wasteful number, since it uses less digits than its factorization.

1641563684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806782 (or 806780 counting only the distinct ones).

The product of its digits is 414720, while the sum is 44.

The square root of 1641563684 is about 40516.2150749549. The cubic root of 1641563684 is about 1179.6483880087.

The spelling of 1641563684 in words is "one billion, six hundred forty-one million, five hundred sixty-three thousand, six hundred eighty-four".