166647487 has 2 divisors, whose sum is σ = 166647488. Its totient is φ = 166647486.

The previous prime is 166647469. The next prime is 166647491. The reversal of 166647487 is 784746661.

It is a strong prime.

It is an emirp because it is prime and its reverse (784746661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166647487 - 2⁷ = 166647359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166647487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166647407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83323743 + 83323744.

It is an arithmetic number, because the mean of its divisors is an integer number (83323744).

Almost surely, 2^166647487 is an apocalyptic number.

166647487 is a deficient number, since it is larger than the sum of its proper divisors (1).

166647487 is an equidigital number, since it uses as much as digits as its factorization.

166647487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1354752, while the sum is 49.

The square root of 166647487 is about 12909.2016406903. The cubic root of 166647487 is about 550.3000973846.

The spelling of 166647487 in words is "one hundred sixty-six million, six hundred forty-seven thousand, four hundred eighty-seven".