646151426 has 4 divisors (see below), whose sum is σ = 969227142. Its totient is φ = 323075712.

The previous prime is 646151393. The next prime is 646151479. The reversal of 646151426 is 624151646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 624151646 = 2 ⋅312075823.

It can be written as a sum of positive squares in only one way, i.e., 642673201 + 3478225 = 25351^2 + 1865^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161537855 + ... + 161537858.

Almost surely, 2^646151426 is an apocalyptic number.

646151426 is a deficient number, since it is larger than the sum of its proper divisors (323075716).

646151426 is a wasteful number, since it uses less digits than its factorization.

646151426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323075715.

The product of its digits is 34560, while the sum is 35.

The square root of 646151426 is about 25419.5087678735. The cubic root of 646151426 is about 864.5260865315.

The spelling of 646151426 in words is "six hundred forty-six million, one hundred fifty-one thousand, four hundred twenty-six".