20346512511671 has 2 divisors, whose sum is σ = 20346512511672. Its totient is φ = 20346512511670.

The previous prime is 20346512511631. The next prime is 20346512511691. The reversal of 20346512511671 is 17611521564302.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20346512511671 - 2¹⁸ = 20346512249527 is a prime.

It is a super-2 number, since 2×20346512511671² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20346512511631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10173256255835 + 10173256255836.

It is an arithmetic number, because the mean of its divisors is an integer number (10173256255836).

Almost surely, 2^{20346512511671} is an apocalyptic number.

20346512511671 is a deficient number, since it is larger than the sum of its proper divisors (1).

20346512511671 is an equidigital number, since it uses as much as digits as its factorization.

20346512511671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 20346512511671 in words is "twenty trillion, three hundred forty-six billion, five hundred twelve million, five hundred eleven thousand, six hundred seventy-one".