166347649 has 4 divisors (see below), whose sum is σ = 179143636. Its totient is φ = 153551664.

The previous prime is 166347647. The next prime is 166347653. The reversal of 166347649 is 946743661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 946743661 = 367 ⋅2579683.

It can be written as a sum of positive squares in 2 ways, for example, as 78588225 + 87759424 = 8865^2 + 9368^2 .

It is a cyclic number.

It is not a de Polignac number, because 166347649 - 2¹ = 166347647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166347599 and 166347608.

It is not an unprimeable number, because it can be changed into a prime (166347647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6397974 + ... + 6397999.

It is an arithmetic number, because the mean of its divisors is an integer number (44785909).

Almost surely, 2^166347649 is an apocalyptic number.

It is an amenable number.

166347649 is a deficient number, since it is larger than the sum of its proper divisors (12795987).

166347649 is a wasteful number, since it uses less digits than its factorization.

166347649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12795986.

The product of its digits is 653184, while the sum is 46.

The square root of 166347649 is about 12897.5830681566. The cubic root of 166347649 is about 549.9698595053.

The spelling of 166347649 in words is "one hundred sixty-six million, three hundred forty-seven thousand, six hundred forty-nine".