206121156266 has 48 divisors (see below), whose sum is σ = 336892221600. Its totient is φ = 94512579840.

The previous prime is 206121156251. The next prime is 206121156281. The reversal of 206121156266 is 662651121602.

It is an interprime number because it is at equal distance from previous prime (206121156251) and next prime (206121156281).

It is a super-4 number, since 4×206121156266⁴ (a number of 46 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10453685 + ... + 10473383.

It is an arithmetic number, because the mean of its divisors is an integer number (7018587950).

Almost surely, 2^206121156266 is an apocalyptic number.

206121156266 is a deficient number, since it is larger than the sum of its proper divisors (130771065334).

206121156266 is a wasteful number, since it uses less digits than its factorization.

206121156266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20199 (or 20182 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

Adding to 206121156266 its reverse (662651121602), we get a palindrome (868772277868).

The spelling of 206121156266 in words is "two hundred six billion, one hundred twenty-one million, one hundred fifty-six thousand, two hundred sixty-six".