12206561538 has 16 divisors (see below), whose sum is σ = 24451098336. Its totient is φ = 4062524640.

The previous prime is 12206561537. The next prime is 12206561539. The reversal of 12206561538 is 83516560221.

It is an interprime number because it is at equal distance from previous prime (12206561537) and next prime (12206561539).

It is a junction number, because it is equal to n+sod(n) for n = 12206561496 and 12206561505.

It is not an unprimeable number, because it can be changed into a prime (12206561531) 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, 1578123 + ... + 1585838.

It is an arithmetic number, because the mean of its divisors is an integer number (1528193646).

Almost surely, 2^12206561538 is an apocalyptic number.

12206561538 is an abundant number, since it is smaller than the sum of its proper divisors (12244536798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12206561538 is a wasteful number, since it uses less digits than its factorization.

12206561538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3164609.

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 12206561538 in words is "twelve billion, two hundred six million, five hundred sixty-one thousand, five hundred thirty-eight".