1961601570871 has 2 divisors, whose sum is σ = 1961601570872. Its totient is φ = 1961601570870.

The previous prime is 1961601570839. The next prime is 1961601570889. The reversal of 1961601570871 is 1780751061691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1961601570871 - 2⁵ = 1961601570839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961601570821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980800785435 + 980800785436.

It is an arithmetic number, because the mean of its divisors is an integer number (980800785436).

Almost surely, 2^{1961601570871} is an apocalyptic number.

1961601570871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961601570871 is an equidigital number, since it uses as much as digits as its factorization.

1961601570871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 52.

The spelling of 1961601570871 in words is "one trillion, nine hundred sixty-one billion, six hundred one million, five hundred seventy thousand, eight hundred seventy-one".