12420013661 has 12 divisors (see below), whose sum is σ = 13969238976. Its totient is φ = 11028337320.

The previous prime is 12420013649. The next prime is 12420013673. The reversal of 12420013661 is 16631002421.

It is an interprime number because it is at equal distance from previous prime (12420013649) and next prime (12420013673).

It is not a de Polignac number, because 12420013661 - 2²⁶ = 12352904797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12420013661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12420013621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1188341 + ... + 1198746.

It is an arithmetic number, because the mean of its divisors is an integer number (1164103248).

Almost surely, 2^12420013661 is an apocalyptic number.

12420013661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12420013661 is a deficient number, since it is larger than the sum of its proper divisors (1549225315).

12420013661 is a wasteful number, since it uses less digits than its factorization.

12420013661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2387152 (or 2387141 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The spelling of 12420013661 in words is "twelve billion, four hundred twenty million, thirteen thousand, six hundred sixty-one".