611745521081 has 2 divisors, whose sum is σ = 611745521082. Its totient is φ = 611745521080.

The previous prime is 611745521077. The next prime is 611745521083. The reversal of 611745521081 is 180125547116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 460035271081 + 151710250000 = 678259^2 + 389500^2 .

It is a cyclic number.

It is not a de Polignac number, because 611745521081 - 2² = 611745521077 is a prime.

It is a super-2 number, since 2×611745521081² (a number of 24 digits) contains 22 as substring.

Together with 611745521083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (611745521083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305872760540 + 305872760541.

It is an arithmetic number, because the mean of its divisors is an integer number (305872760541).

Almost surely, 2^611745521081 is an apocalyptic number.

It is an amenable number.

611745521081 is a deficient number, since it is larger than the sum of its proper divisors (1).

611745521081 is an equidigital number, since it uses as much as digits as its factorization.

611745521081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67200, while the sum is 41.

The spelling of 611745521081 in words is "six hundred eleven billion, seven hundred forty-five million, five hundred twenty-one thousand, eighty-one".