206401523355 has 48 divisors (see below), whose sum is σ = 374615404800. Its totient is φ = 109012000608.

The previous prime is 206401523329. The next prime is 206401523381. The reversal of 206401523355 is 553325104602.

206401523355 is a `hidden beast` number, since 2 + 0 + 640 + 1 + 5 + 2 + 3 + 3 + 5 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (206401523329) and next prime (206401523381).

It is not a de Polignac number, because 206401523355 - 2¹⁰ = 206401522331 is a prime.

It is a super-2 number, since 2×206401523355² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 699505 + ... + 949794.

It is an arithmetic number, because the mean of its divisors is an integer number (7804487600).

Almost surely, 2^206401523355 is an apocalyptic number.

206401523355 is a deficient number, since it is larger than the sum of its proper divisors (168213881445).

206401523355 is a wasteful number, since it uses less digits than its factorization.

206401523355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649422 (or 1649410 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

Adding to 206401523355 its reverse (553325104602), we get a palindrome (759726627957).

The spelling of 206401523355 in words is "two hundred six billion, four hundred one million, five hundred twenty-three thousand, three hundred fifty-five".