15505919761 has 2 divisors, whose sum is σ = 15505919762. Its totient is φ = 15505919760.

The previous prime is 15505919747. The next prime is 15505919783. The reversal of 15505919761 is 16791950551.

15505919761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15411732736 + 94187025 = 124144^2 + 9705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15505919761 is a prime.

It is not a weakly prime, because it can be changed into another prime (15505919701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7752959880 + 7752959881.

It is an arithmetic number, because the mean of its divisors is an integer number (7752959881).

Almost surely, 2^15505919761 is an apocalyptic number.

It is an amenable number.

15505919761 is a deficient number, since it is larger than the sum of its proper divisors (1).

15505919761 is an equidigital number, since it uses as much as digits as its factorization.

15505919761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 425250, while the sum is 49.

The spelling of 15505919761 in words is "fifteen billion, five hundred five million, nine hundred nineteen thousand, seven hundred sixty-one".