20315686519 has 2 divisors, whose sum is σ = 20315686520. Its totient is φ = 20315686518.

The previous prime is 20315686507. The next prime is 20315686609. The reversal of 20315686519 is 91568651302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20315686519 - 2⁵ = 20315686487 is a prime.

It is a super-2 number, since 2×20315686519² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20315680519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10157843259 + 10157843260.

It is an arithmetic number, because the mean of its divisors is an integer number (10157843260).

Almost surely, 2^20315686519 is an apocalyptic number.

20315686519 is a deficient number, since it is larger than the sum of its proper divisors (1).

20315686519 is an equidigital number, since it uses as much as digits as its factorization.

20315686519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 20315686519 in words is "twenty billion, three hundred fifteen million, six hundred eighty-six thousand, five hundred nineteen".