166078447 has 4 divisors (see below), whose sum is σ = 171805320. Its totient is φ = 160351576.

The previous prime is 166078433. The next prime is 166078489. The reversal of 166078447 is 744870661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 744870661 = 19 ⋅39203719.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166078447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166070447) 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, 2863393 + ... + 2863450.

It is an arithmetic number, because the mean of its divisors is an integer number (42951330).

Almost surely, 2^166078447 is an apocalyptic number.

166078447 is a deficient number, since it is larger than the sum of its proper divisors (5726873).

166078447 is an equidigital number, since it uses as much as digits as its factorization.

166078447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5726872.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 166078447 is about 12887.1427011576. The cubic root of 166078447 is about 549.6730254872.

The spelling of 166078447 in words is "one hundred sixty-six million, seventy-eight thousand, four hundred forty-seven".