51570471661 has 2 divisors, whose sum is σ = 51570471662. Its totient is φ = 51570471660.

The previous prime is 51570471649. The next prime is 51570471671. The reversal of 51570471661 is 16617407515.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31708924900 + 19861546761 = 178070^2 + 140931^2 .

It is a cyclic number.

It is not a de Polignac number, because 51570471661 - 2¹⁷ = 51570340589 is a prime.

It is a super-3 number, since 3×51570471661³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51570471671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25785235830 + 25785235831.

It is an arithmetic number, because the mean of its divisors is an integer number (25785235831).

Almost surely, 2^51570471661 is an apocalyptic number.

It is an amenable number.

51570471661 is a deficient number, since it is larger than the sum of its proper divisors (1).

51570471661 is an equidigital number, since it uses as much as digits as its factorization.

51570471661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 176400, while the sum is 43.

The spelling of 51570471661 in words is "fifty-one billion, five hundred seventy million, four hundred seventy-one thousand, six hundred sixty-one".