646357752255 has 8 divisors (see below), whose sum is σ = 1034172403632. Its totient is φ = 344724134528.

The previous prime is 646357752251. The next prime is 646357752259. The reversal of 646357752255 is 552257753646.

It is an interprime number because it is at equal distance from previous prime (646357752251) and next prime (646357752259).

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 646357752255 - 2² = 646357752251 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646357752195 and 646357752204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646357752251) 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, 21545258394 + ... + 21545258423.

It is an arithmetic number, because the mean of its divisors is an integer number (129271550454).

Almost surely, 2^646357752255 is an apocalyptic number.

646357752255 is a deficient number, since it is larger than the sum of its proper divisors (387814651377).

646357752255 is a wasteful number, since it uses less digits than its factorization.

646357752255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43090516825.

The product of its digits is 52920000, while the sum is 57.

The spelling of 646357752255 in words is "six hundred forty-six billion, three hundred fifty-seven million, seven hundred fifty-two thousand, two hundred fifty-five".