1641563647 has 16 divisors (see below), whose sum is σ = 1735020000. Its totient is φ = 1550733184.

The previous prime is 1641563597. The next prime is 1641563683. The reversal of 1641563647 is 7463651461.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1641563647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641563687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 642729 + ... + 645277.

It is an arithmetic number, because the mean of its divisors is an integer number (108438750).

Almost surely, 2^1641563647 is an apocalyptic number.

1641563647 is a deficient number, since it is larger than the sum of its proper divisors (93456353).

1641563647 is a wasteful number, since it uses less digits than its factorization.

1641563647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3050.

The product of its digits is 362880, while the sum is 43.

The square root of 1641563647 is about 40516.2146183476. The cubic root of 1641563647 is about 1179.6483791458.

The spelling of 1641563647 in words is "one billion, six hundred forty-one million, five hundred sixty-three thousand, six hundred forty-seven".