505601655401 has 2 divisors, whose sum is σ = 505601655402. Its totient is φ = 505601655400.

The previous prime is 505601655343. The next prime is 505601655409. The reversal of 505601655401 is 104556106505.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 499073015401 + 6528640000 = 706451^2 + 80800^2 .

It is a cyclic number.

It is not a de Polignac number, because 505601655401 - 2⁶ = 505601655337 is a prime.

It is not a weakly prime, because it can be changed into another prime (505601655409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252800827700 + 252800827701.

It is an arithmetic number, because the mean of its divisors is an integer number (252800827701).

Almost surely, 2^505601655401 is an apocalyptic number.

It is an amenable number.

505601655401 is a deficient number, since it is larger than the sum of its proper divisors (1).

505601655401 is an equidigital number, since it uses as much as digits as its factorization.

505601655401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90000, while the sum is 38.

The spelling of 505601655401 in words is "five hundred five billion, six hundred one million, six hundred fifty-five thousand, four hundred one".