12661798022 has 16 divisors (see below), whose sum is σ = 19464801552. Its totient is φ = 6173671680.

The previous prime is 12661798001. The next prime is 12661798049. The reversal of 12661798022 is 22089716621.

It is a happy number.

It is a super-2 number, since 2×12661798022² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151838 + ... + 219950.

It is an arithmetic number, because the mean of its divisors is an integer number (1216550097).

Almost surely, 2^12661798022 is an apocalyptic number.

12661798022 is a deficient number, since it is larger than the sum of its proper divisors (6803003530).

12661798022 is a wasteful number, since it uses less digits than its factorization.

12661798022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70423.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 12661798022 in words is "twelve billion, six hundred sixty-one million, seven hundred ninety-eight thousand, twenty-two".