15564447361 has 2 divisors, whose sum is σ = 15564447362. Its totient is φ = 15564447360.

The previous prime is 15564447337. The next prime is 15564447373. The reversal of 15564447361 is 16374446551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15014826225 + 549621136 = 122535^2 + 23444^2 .

It is a cyclic number.

It is not a de Polignac number, because 15564447361 - 2¹³ = 15564439169 is a prime.

It is not a weakly prime, because it can be changed into another prime (15564447391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7782223680 + 7782223681.

It is an arithmetic number, because the mean of its divisors is an integer number (7782223681).

Almost surely, 2^15564447361 is an apocalyptic number.

It is an amenable number.

15564447361 is a deficient number, since it is larger than the sum of its proper divisors (1).

15564447361 is an equidigital number, since it uses as much as digits as its factorization.

15564447361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1209600, while the sum is 46.

The spelling of 15564447361 in words is "fifteen billion, five hundred sixty-four million, four hundred forty-seven thousand, three hundred sixty-one".