71153565250661 has 2 divisors, whose sum is σ = 71153565250662. Its totient is φ = 71153565250660.

The previous prime is 71153565250633. The next prime is 71153565250667. The reversal of 71153565250661 is 16605256535117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69262857749761 + 1890707500900 = 8322431^2 + 1375030^2 .

It is a cyclic number.

It is not a de Polignac number, because 71153565250661 - 2⁶ = 71153565250597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71153565250667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35576782625330 + 35576782625331.

It is an arithmetic number, because the mean of its divisors is an integer number (35576782625331).

Almost surely, 2^{71153565250661} is an apocalyptic number.

It is an amenable number.

71153565250661 is a deficient number, since it is larger than the sum of its proper divisors (1).

71153565250661 is an equidigital number, since it uses as much as digits as its factorization.

71153565250661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670000, while the sum is 53.

The spelling of 71153565250661 in words is "seventy-one trillion, one hundred fifty-three billion, five hundred sixty-five million, two hundred fifty thousand, six hundred sixty-one".