1871660315197 has 2 divisors, whose sum is σ = 1871660315198. Its totient is φ = 1871660315196.

The previous prime is 1871660315177. The next prime is 1871660315221. The reversal of 1871660315197 is 7915130661781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1736950028356 + 134710286841 = 1317934^2 + 367029^2 .

It is a cyclic number.

It is not a de Polignac number, because 1871660315197 - 2²³ = 1871651926589 is a prime.

It is a super-2 number, since 2×1871660315197² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1871660315177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 935830157598 + 935830157599.

It is an arithmetic number, because the mean of its divisors is an integer number (935830157599).

Almost surely, 2^{1871660315197} is an apocalyptic number.

It is an amenable number.

1871660315197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1871660315197 is an equidigital number, since it uses as much as digits as its factorization.

1871660315197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1905120, while the sum is 55.

The spelling of 1871660315197 in words is "one trillion, eight hundred seventy-one billion, six hundred sixty million, three hundred fifteen thousand, one hundred ninety-seven".