646255655 has 8 divisors (see below), whose sum is σ = 788220384. Its totient is φ = 508528800.

The previous prime is 646255651. The next prime is 646255661. The reversal of 646255655 is 556552646.

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

It is not a de Polignac number, because 646255655 - 2² = 646255651 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646255651) 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, 1059131 + ... + 1059740.

It is an arithmetic number, because the mean of its divisors is an integer number (98527548).

Almost surely, 2^646255655 is an apocalyptic number.

646255655 is a deficient number, since it is larger than the sum of its proper divisors (141964729).

646255655 is a wasteful number, since it uses less digits than its factorization.

646255655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2118937.

The product of its digits is 1080000, while the sum is 44.

The square root of 646255655 is about 25421.5588625088. The cubic root of 646255655 is about 864.5725688478.

The spelling of 646255655 in words is "six hundred forty-six million, two hundred fifty-five thousand, six hundred fifty-five".