20670505619537 has 2 divisors, whose sum is σ = 20670505619538. Its totient is φ = 20670505619536.

The previous prime is 20670505619503. The next prime is 20670505619579. The reversal of 20670505619537 is 73591650507602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17454021195601 + 3216484423936 = 4177801^2 + 1793456^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20670505619537 is a prime.

It is not a weakly prime, because it can be changed into another prime (20670505519537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10335252809768 + 10335252809769.

It is an arithmetic number, because the mean of its divisors is an integer number (10335252809769).

Almost surely, 2^{20670505619537} is an apocalyptic number.

It is an amenable number.

20670505619537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20670505619537 is an equidigital number, since it uses as much as digits as its factorization.

20670505619537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11907000, while the sum is 56.

The spelling of 20670505619537 in words is "twenty trillion, six hundred seventy billion, five hundred five million, six hundred nineteen thousand, five hundred thirty-seven".