187708161493 has 2 divisors, whose sum is σ = 187708161494. Its totient is φ = 187708161492.

The previous prime is 187708161463. The next prime is 187708161527. The reversal of 187708161493 is 394161807781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165976389604 + 21731771889 = 407402^2 + 147417^2 .

It is a cyclic number.

It is not a de Polignac number, because 187708161493 - 2³³ = 179118226901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187708161463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93854080746 + 93854080747.

It is an arithmetic number, because the mean of its divisors is an integer number (93854080747).

Almost surely, 2^187708161493 is an apocalyptic number.

It is an amenable number.

187708161493 is a deficient number, since it is larger than the sum of its proper divisors (1).

187708161493 is an equidigital number, since it uses as much as digits as its factorization.

187708161493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 187708161493 in words is "one hundred eighty-seven billion, seven hundred eight million, one hundred sixty-one thousand, four hundred ninety-three".