20015605601 has 2 divisors, whose sum is σ = 20015605602. Its totient is φ = 20015605600.

The previous prime is 20015605591. The next prime is 20015605619. The reversal of 20015605601 is 10650651002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18735039376 + 1280566225 = 136876^2 + 35785^2 .

It is a cyclic number.

It is not a de Polignac number, because 20015605601 - 2¹⁸ = 20015343457 is a prime.

It is not a weakly prime, because it can be changed into another prime (20015605301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10007802800 + 10007802801.

It is an arithmetic number, because the mean of its divisors is an integer number (10007802801).

Almost surely, 2^20015605601 is an apocalyptic number.

It is an amenable number.

20015605601 is a deficient number, since it is larger than the sum of its proper divisors (1).

20015605601 is an equidigital number, since it uses as much as digits as its factorization.

20015605601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The spelling of 20015605601 in words is "twenty billion, fifteen million, six hundred five thousand, six hundred one".