7611322561 has 2 divisors, whose sum is σ = 7611322562. Its totient is φ = 7611322560.

The previous prime is 7611322547. The next prime is 7611322583. The reversal of 7611322561 is 1652231167.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4936467600 + 2674854961 = 70260^2 + 51719^2 .

It is a cyclic number.

It is not a de Polignac number, because 7611322561 - 2²¹ = 7609225409 is a prime.

It is a super-2 number, since 2×7611322561² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7611322591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3805661280 + 3805661281.

It is an arithmetic number, because the mean of its divisors is an integer number (3805661281).

Almost surely, 2^7611322561 is an apocalyptic number.

It is an amenable number.

7611322561 is a deficient number, since it is larger than the sum of its proper divisors (1).

7611322561 is an equidigital number, since it uses as much as digits as its factorization.

7611322561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 34.

The square root of 7611322561 is about 87242.8940430107. The cubic root of 7611322561 is about 1967.0710303491.

The spelling of 7611322561 in words is "seven billion, six hundred eleven million, three hundred twenty-two thousand, five hundred sixty-one".