191682179861 has 2 divisors, whose sum is σ = 191682179862. Its totient is φ = 191682179860.

The previous prime is 191682179827. The next prime is 191682179903. The reversal of 191682179861 is 168971286191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123503747761 + 68178432100 = 351431^2 + 261110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191682179861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191682179861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191682139861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95841089930 + 95841089931.

It is an arithmetic number, because the mean of its divisors is an integer number (95841089931).

Almost surely, 2^191682179861 is an apocalyptic number.

It is an amenable number.

191682179861 is a deficient number, since it is larger than the sum of its proper divisors (1).

191682179861 is an equidigital number, since it uses as much as digits as its factorization.

191682179861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 59.

The spelling of 191682179861 in words is "one hundred ninety-one billion, six hundred eighty-two million, one hundred seventy-nine thousand, eight hundred sixty-one".