245505555601 has 2 divisors, whose sum is σ = 245505555602. Its totient is φ = 245505555600.

The previous prime is 245505555599. The next prime is 245505555611. The reversal of 245505555601 is 106555505542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208370338576 + 37135217025 = 456476^2 + 192705^2 .

It is a cyclic number.

It is not a de Polignac number, because 245505555601 - 2¹ = 245505555599 is a prime.

Together with 245505555599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (245505555611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122752777800 + 122752777801.

It is an arithmetic number, because the mean of its divisors is an integer number (122752777801).

Almost surely, 2^245505555601 is an apocalyptic number.

It is an amenable number.

245505555601 is a deficient number, since it is larger than the sum of its proper divisors (1).

245505555601 is an equidigital number, since it uses as much as digits as its factorization.

245505555601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 750000, while the sum is 43.

The spelling of 245505555601 in words is "two hundred forty-five billion, five hundred five million, five hundred fifty-five thousand, six hundred one".