20346512511557 has 2 divisors, whose sum is σ = 20346512511558. Its totient is φ = 20346512511556.

The previous prime is 20346512511551. The next prime is 20346512511617. The reversal of 20346512511557 is 75511521564302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17646771049636 + 2699741461921 = 4200806^2 + 1643089^2 .

It is a cyclic number.

It is not a de Polignac number, because 20346512511557 - 2⁸ = 20346512511301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20346512511551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10173256255778 + 10173256255779.

It is an arithmetic number, because the mean of its divisors is an integer number (10173256255779).

Almost surely, 2^{20346512511557} is an apocalyptic number.

It is an amenable number.

20346512511557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20346512511557 is an equidigital number, since it uses as much as digits as its factorization.

20346512511557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260000, while the sum is 47.

The spelling of 20346512511557 in words is "twenty trillion, three hundred forty-six billion, five hundred twelve million, five hundred eleven thousand, five hundred fifty-seven".