15561134471 has 2 divisors, whose sum is σ = 15561134472. Its totient is φ = 15561134470.

The previous prime is 15561134461. The next prime is 15561134473. The reversal of 15561134471 is 17443116551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15561134471 - 2²² = 15556940167 is a prime.

It is a super-3 number, since 3×15561134471³ (a number of 32 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 15561134473, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15561134473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7780567235 + 7780567236.

It is an arithmetic number, because the mean of its divisors is an integer number (7780567236).

Almost surely, 2^15561134471 is an apocalyptic number.

15561134471 is a deficient number, since it is larger than the sum of its proper divisors (1).

15561134471 is an equidigital number, since it uses as much as digits as its factorization.

15561134471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 38.

The spelling of 15561134471 in words is "fifteen billion, five hundred sixty-one million, one hundred thirty-four thousand, four hundred seventy-one".