20646415377559 has 2 divisors, whose sum is σ = 20646415377560. Its totient is φ = 20646415377558.

The previous prime is 20646415377541. The next prime is 20646415377619. The reversal of 20646415377559 is 95577351464602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20646415377559 - 2⁹ = 20646415377047 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20646415377559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20646415317559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10323207688779 + 10323207688780.

It is an arithmetic number, because the mean of its divisors is an integer number (10323207688780).

Almost surely, 2^{20646415377559} is an apocalyptic number.

20646415377559 is a deficient number, since it is larger than the sum of its proper divisors (1).

20646415377559 is an equidigital number, since it uses as much as digits as its factorization.

20646415377559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512000, while the sum is 64.

The spelling of 20646415377559 in words is "twenty trillion, six hundred forty-six billion, four hundred fifteen million, three hundred seventy-seven thousand, five hundred fifty-nine".