12227447661 has 32 divisors (see below), whose sum is σ = 19166861952. Its totient is φ = 6835752960.

The previous prime is 12227447647. The next prime is 12227447669. The reversal of 12227447661 is 16674472221.

It is not a de Polignac number, because 12227447661 - 2⁵ = 12227447629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12227447669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 657061 + ... + 675413.

It is an arithmetic number, because the mean of its divisors is an integer number (598964436).

Almost surely, 2^12227447661 is an apocalyptic number.

12227447661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12227447661 is a deficient number, since it is larger than the sum of its proper divisors (6939414291).

12227447661 is a wasteful number, since it uses less digits than its factorization.

12227447661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19933.

The product of its digits is 225792, while the sum is 42.

The spelling of 12227447661 in words is "twelve billion, two hundred twenty-seven million, four hundred forty-seven thousand, six hundred sixty-one".