20350352621509 has 2 divisors, whose sum is σ = 20350352621510. Its totient is φ = 20350352621508.

The previous prime is 20350352621453. The next prime is 20350352621597. The reversal of 20350352621509 is 90512625305302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16658274917025 + 3692077704484 = 4081455^2 + 1921478^2 .

It is a cyclic number.

It is not a de Polignac number, because 20350352621509 - 2¹³ = 20350352613317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20350352631509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10175176310754 + 10175176310755.

It is an arithmetic number, because the mean of its divisors is an integer number (10175176310755).

Almost surely, 2^{20350352621509} is an apocalyptic number.

It is an amenable number.

20350352621509 is a deficient number, since it is larger than the sum of its proper divisors (1).

20350352621509 is an equidigital number, since it uses as much as digits as its factorization.

20350352621509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486000, while the sum is 43.

The spelling of 20350352621509 in words is "twenty trillion, three hundred fifty billion, three hundred fifty-two million, six hundred twenty-one thousand, five hundred nine".