6646174394 has 4 divisors (see below), whose sum is σ = 9969261594. Its totient is φ = 3323087196.

The previous prime is 6646174391. The next prime is 6646174433. The reversal of 6646174394 is 4934716466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4934716466 = 2 ⋅2467358233.

It can be written as a sum of positive squares in only one way, i.e., 6636220369 + 9954025 = 81463^2 + 3155^2 .

It is a super-2 number, since 2×6646174394² = 88343268150922534472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6646174391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1661543597 + ... + 1661543600.

Almost surely, 2^6646174394 is an apocalyptic number.

6646174394 is a deficient number, since it is larger than the sum of its proper divisors (3323087200).

6646174394 is a wasteful number, since it uses less digits than its factorization.

6646174394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3323087199.

The product of its digits is 2612736, while the sum is 50.

The square root of 6646174394 is about 81524.0724816910. The cubic root of 6646174394 is about 1880.1416818301.

The spelling of 6646174394 in words is "six billion, six hundred forty-six million, one hundred seventy-four thousand, three hundred ninety-four".