166947371594 has 4 divisors (see below), whose sum is σ = 250421057394. Its totient is φ = 83473685796.

The previous prime is 166947371581. The next prime is 166947371621. The reversal of 166947371594 is 495173749661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 495173749661 = 53 ⋅9342900937.

It can be written as a sum of positive squares in only one way, i.e., 138691442569 + 28255929025 = 372413^2 + 168095^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41736842897 + ... + 41736842900.

Almost surely, 2^166947371594 is an apocalyptic number.

166947371594 is a deficient number, since it is larger than the sum of its proper divisors (83473685800).

166947371594 is an equidigital number, since it uses as much as digits as its factorization.

166947371594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83473685799.

The product of its digits is 34292160, while the sum is 62.

The spelling of 166947371594 in words is "one hundred sixty-six billion, nine hundred forty-seven million, three hundred seventy-one thousand, five hundred ninety-four".