12261981061 has 8 divisors (see below), whose sum is σ = 13399271424. Its totient is φ = 11128451520.

The previous prime is 12261981029. The next prime is 12261981077. The reversal of 12261981061 is 16018916221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12261981061 - 2⁵ = 12261981029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12261981061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12261981001) 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, 933381 + ... + 946426.

It is an arithmetic number, because the mean of its divisors is an integer number (1674908928).

Almost surely, 2^12261981061 is an apocalyptic number.

12261981061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12261981061 is a deficient number, since it is larger than the sum of its proper divisors (1137290363).

12261981061 is a wasteful number, since it uses less digits than its factorization.

12261981061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880411.

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 12261981061 in words is "twelve billion, two hundred sixty-one million, nine hundred eighty-one thousand, sixty-one".