611564656201 has 2 divisors, whose sum is σ = 611564656202. Its totient is φ = 611564656200.

The previous prime is 611564656169. The next prime is 611564656217. The reversal of 611564656201 is 102656465116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 498146582025 + 113418074176 = 705795^2 + 336776^2 .

It is a cyclic number.

It is not a de Polignac number, because 611564656201 - 2⁵ = 611564656169 is a prime.

It is a super-2 number, since 2×611564656201² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (611564636201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305782328100 + 305782328101.

It is an arithmetic number, because the mean of its divisors is an integer number (305782328101).

Almost surely, 2^611564656201 is an apocalyptic number.

It is an amenable number.

611564656201 is a deficient number, since it is larger than the sum of its proper divisors (1).

611564656201 is an equidigital number, since it uses as much as digits as its factorization.

611564656201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 611564656201 in words is "six hundred eleven billion, five hundred sixty-four million, six hundred fifty-six thousand, two hundred one".