611909523817 has 2 divisors, whose sum is σ = 611909523818. Its totient is φ = 611909523816.

The previous prime is 611909523691. The next prime is 611909523821. The reversal of 611909523817 is 718325909116.

611909523817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 579187969936 + 32721553881 = 761044^2 + 180891^2 .

It is a cyclic number.

It is not a de Polignac number, because 611909523817 - 2³¹ = 609762040169 is a prime.

It is not a weakly prime, because it can be changed into another prime (611909533817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305954761908 + 305954761909.

It is an arithmetic number, because the mean of its divisors is an integer number (305954761909).

Almost surely, 2^611909523817 is an apocalyptic number.

It is an amenable number.

611909523817 is a deficient number, since it is larger than the sum of its proper divisors (1).

611909523817 is an equidigital number, since it uses as much as digits as its factorization.

611909523817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 52.

The spelling of 611909523817 in words is "six hundred eleven billion, nine hundred nine million, five hundred twenty-three thousand, eight hundred seventeen".