646464551006 has 4 divisors (see below), whose sum is σ = 969696826512. Its totient is φ = 323232275502.

The previous prime is 646464551003. The next prime is 646464551009. The reversal of 646464551006 is 600155464646.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (646464551003) and next prime (646464551009).

It is a super-2 number, since 2×646464551006² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646464551003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161616137750 + ... + 161616137753.

It is an arithmetic number, because the mean of its divisors is an integer number (242424206628).

Almost surely, 2^646464551006 is an apocalyptic number.

646464551006 is a deficient number, since it is larger than the sum of its proper divisors (323232275506).

646464551006 is a wasteful number, since it uses less digits than its factorization.

646464551006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323232275505.

The product of its (nonzero) digits is 2073600, while the sum is 47.

The spelling of 646464551006 in words is "six hundred forty-six billion, four hundred sixty-four million, five hundred fifty-one thousand, six".