15534363661 has 2 divisors, whose sum is σ = 15534363662. Its totient is φ = 15534363660.

The previous prime is 15534363659. The next prime is 15534363707. The reversal of 15534363661 is 16636343551.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15377488036 + 156875625 = 124006^2 + 12525^2 .

It is a cyclic number.

It is not a de Polignac number, because 15534363661 - 2¹ = 15534363659 is a prime.

Together with 15534363659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15534364661) 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, 7767181830 + 7767181831.

It is an arithmetic number, because the mean of its divisors is an integer number (7767181831).

Almost surely, 2^15534363661 is an apocalyptic number.

It is an amenable number.

15534363661 is a deficient number, since it is larger than the sum of its proper divisors (1).

15534363661 is an equidigital number, since it uses as much as digits as its factorization.

15534363661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 43.

The spelling of 15534363661 in words is "fifteen billion, five hundred thirty-four million, three hundred sixty-three thousand, six hundred sixty-one".