20000641653 has 6 divisors (see below), whose sum is σ = 28889815734. Its totient is φ = 13333761096.

The previous prime is 20000641651. The next prime is 20000641657. The reversal of 20000641653 is 35614600002.

20000641653 is a `hidden beast` number, since 2 + 0 + 0 + 0 + 0 + 6 + 4 + 1 + 653 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16657257969 + 3343383684 = 129063^2 + 57822^2 .

It is not a de Polignac number, because 20000641653 - 2¹ = 20000641651 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000641651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1111146750 + ... + 1111146767.

It is an arithmetic number, because the mean of its divisors is an integer number (4814969289).

Almost surely, 2^20000641653 is an apocalyptic number.

It is an amenable number.

20000641653 is a deficient number, since it is larger than the sum of its proper divisors (8889174081).

20000641653 is a wasteful number, since it uses less digits than its factorization.

20000641653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222293523 (or 2222293520 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The spelling of 20000641653 in words is "twenty billion, six hundred forty-one thousand, six hundred fifty-three".