15557119561 has 2 divisors, whose sum is σ = 15557119562. Its totient is φ = 15557119560.

The previous prime is 15557119547. The next prime is 15557119601. The reversal of 15557119561 is 16591175551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10066309561 + 5490810000 = 100331^2 + 74100^2 .

It is a cyclic number.

It is not a de Polignac number, because 15557119561 - 2¹³ = 15557111369 is a prime.

It is not a weakly prime, because it can be changed into another prime (15557119531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7778559780 + 7778559781.

It is an arithmetic number, because the mean of its divisors is an integer number (7778559781).

Almost surely, 2^15557119561 is an apocalyptic number.

It is an amenable number.

15557119561 is a deficient number, since it is larger than the sum of its proper divisors (1).

15557119561 is an equidigital number, since it uses as much as digits as its factorization.

15557119561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 236250, while the sum is 46.

The spelling of 15557119561 in words is "fifteen billion, five hundred fifty-seven million, one hundred nineteen thousand, five hundred sixty-one".