206011521263 has 4 divisors (see below), whose sum is σ = 206935339968. Its totient is φ = 205087702560.

The previous prime is 206011521239. The next prime is 206011521281. The reversal of 206011521263 is 362125110602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 362125110602 = 2 ⋅181062555301.

It is a cyclic number.

It is not a de Polignac number, because 206011521263 - 2¹⁸ = 206011259119 is a prime.

It is a super-2 number, since 2×206011521263² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206011521563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461909018 + ... + 461909463.

It is an arithmetic number, because the mean of its divisors is an integer number (51733834992).

Almost surely, 2^206011521263 is an apocalyptic number.

206011521263 is a deficient number, since it is larger than the sum of its proper divisors (923818705).

206011521263 is an equidigital number, since it uses as much as digits as its factorization.

206011521263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923818704.

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 206011521263 its reverse (362125110602), we get a palindrome (568136631865).

The spelling of 206011521263 in words is "two hundred six billion, eleven million, five hundred twenty-one thousand, two hundred sixty-three".