126206561211 has 4 divisors (see below), whose sum is σ = 168275414952. Its totient is φ = 84137707472.

The previous prime is 126206561209. The next prime is 126206561263. The reversal of 126206561211 is 112165602621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126206561211 - 2¹ = 126206561209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126206561111) 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, 21034426866 + ... + 21034426871.

It is an arithmetic number, because the mean of its divisors is an integer number (42068853738).

Almost surely, 2^126206561211 is an apocalyptic number.

126206561211 is a deficient number, since it is larger than the sum of its proper divisors (42068853741).

126206561211 is an equidigital number, since it uses as much as digits as its factorization.

126206561211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42068853740.

The product of its (nonzero) digits is 8640, while the sum is 33.

The spelling of 126206561211 in words is "one hundred twenty-six billion, two hundred six million, five hundred sixty-one thousand, two hundred eleven".