15566441121 has 48 divisors (see below), whose sum is σ = 28061549568. Its totient is φ = 8078248800.

The previous prime is 15566441083. The next prime is 15566441129. The reversal of 15566441121 is 12114466551.

15566441121 is a `hidden beast` number, since 1 + 5 + 5 + 6 + 644 + 1 + 1 + 2 + 1 = 666.

It is not a de Polignac number, because 15566441121 - 2⁶ = 15566441057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15566441129) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 703590 + ... + 725376.

It is an arithmetic number, because the mean of its divisors is an integer number (584615616).

Almost surely, 2^15566441121 is an apocalyptic number.

15566441121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15566441121 is a deficient number, since it is larger than the sum of its proper divisors (12495108447).

15566441121 is a wasteful number, since it uses less digits than its factorization.

15566441121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22842 (or 22839 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The spelling of 15566441121 in words is "fifteen billion, five hundred sixty-six million, four hundred forty-one thousand, one hundred twenty-one".