15515442401 has 2 divisors, whose sum is σ = 15515442402. Its totient is φ = 15515442400.

The previous prime is 15515442361. The next prime is 15515442407. The reversal of 15515442401 is 10424451551.

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., 10009802401 + 5505640000 = 100049^2 + 74200^2 .

It is an emirp because it is prime and its reverse (10424451551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15515442401 - 2¹⁰ = 15515441377 is a prime.

It is not a weakly prime, because it can be changed into another prime (15515442407) 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, 7757721200 + 7757721201.

It is an arithmetic number, because the mean of its divisors is an integer number (7757721201).

Almost surely, 2^15515442401 is an apocalyptic number.

It is an amenable number.

15515442401 is a deficient number, since it is larger than the sum of its proper divisors (1).

15515442401 is an equidigital number, since it uses as much as digits as its factorization.

15515442401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16000, while the sum is 32.

Adding to 15515442401 its reverse (10424451551), we get a palindrome (25939893952).

The spelling of 15515442401 in words is "fifteen billion, five hundred fifteen million, four hundred forty-two thousand, four hundred one".