20315123566664 has 8 divisors (see below), whose sum is σ = 38090856687510. Its totient is φ = 10157561783328.

The previous prime is 20315123566631. The next prime is 20315123566697. The reversal of 20315123566664 is 46666532151302.

It is an interprime number because it is at equal distance from previous prime (20315123566631) and next prime (20315123566697).

It can be written as a sum of positive squares in only one way, i.e., 13806798062500 + 6508325504164 = 3715750^2 + 2551142^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1269695222909 + ... + 1269695222924.

Almost surely, 2^{20315123566664} is an apocalyptic number.

It is an amenable number.

20315123566664 is a deficient number, since it is larger than the sum of its proper divisors (17775733120846).

20315123566664 is a wasteful number, since it uses less digits than its factorization.

20315123566664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2539390445839 (or 2539390445835 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 50.

The spelling of 20315123566664 in words is "twenty trillion, three hundred fifteen billion, one hundred twenty-three million, five hundred sixty-six thousand, six hundred sixty-four".