20315653104665 has 8 divisors (see below), whose sum is σ = 24379170474120. Its totient is φ = 16252264651392.

The previous prime is 20315653104661. The next prime is 20315653104689. The reversal of 20315653104665 is 56640135651302.

It can be written as a sum of positive squares in 4 ways, for example, as 757925206921 + 19557727897744 = 870589^2 + 4422412^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20315653104665 - 2² = 20315653104661 is a prime.

It is a super-2 number, since 2×20315653104665² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20315653104661) 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, 31882010 + ... + 32512979.

It is an arithmetic number, because the mean of its divisors is an integer number (3047396309265).

Almost surely, 2^{20315653104665} is an apocalyptic number.

It is an amenable number.

20315653104665 is a deficient number, since it is larger than the sum of its proper divisors (4063517369455).

20315653104665 is an equidigital number, since it uses as much as digits as its factorization.

20315653104665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64458091.

The product of its (nonzero) digits is 1944000, while the sum is 47.

Adding to 20315653104665 its reverse (56640135651302), we get a palindrome (76955788755967).

The spelling of 20315653104665 in words is "twenty trillion, three hundred fifteen billion, six hundred fifty-three million, one hundred four thousand, six hundred sixty-five".