187339890457 has 2 divisors, whose sum is σ = 187339890458. Its totient is φ = 187339890456.

The previous prime is 187339890407. The next prime is 187339890487. The reversal of 187339890457 is 754098933781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111969875161 + 75370015296 = 334619^2 + 274536^2 .

It is an emirp because it is prime and its reverse (754098933781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 187339890457 - 2¹⁹ = 187339366169 is a prime.

It is not a weakly prime, because it can be changed into another prime (187339890407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93669945228 + 93669945229.

It is an arithmetic number, because the mean of its divisors is an integer number (93669945229).

Almost surely, 2^187339890457 is an apocalyptic number.

It is an amenable number.

187339890457 is a deficient number, since it is larger than the sum of its proper divisors (1).

187339890457 is an equidigital number, since it uses as much as digits as its factorization.

187339890457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45722880, while the sum is 64.

The spelling of 187339890457 in words is "one hundred eighty-seven billion, three hundred thirty-nine million, eight hundred ninety thousand, four hundred fifty-seven".