646338855 has 8 divisors (see below), whose sum is σ = 1034142192. Its totient is φ = 344714048.

The previous prime is 646338853. The next prime is 646338881. The reversal of 646338855 is 558833646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646338855 - 2¹ = 646338853 is a prime.

It is a super-2 number, since 2×646338855² = 835507830965422050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646338853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21544614 + ... + 21544643.

It is an arithmetic number, because the mean of its divisors is an integer number (129267774).

Almost surely, 2^646338855 is an apocalyptic number.

646338855 is a deficient number, since it is larger than the sum of its proper divisors (387803337).

646338855 is a wasteful number, since it uses less digits than its factorization.

646338855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43089265.

The product of its digits is 2073600, while the sum is 48.

The square root of 646338855 is about 25423.1952161800. The cubic root of 646338855 is about 864.6096694134.

The spelling of 646338855 in words is "six hundred forty-six million, three hundred thirty-eight thousand, eight hundred fifty-five".