15535542454321 has 2 divisors, whose sum is σ = 15535542454322. Its totient is φ = 15535542454320.

The previous prime is 15535542454309. The next prime is 15535542454343. The reversal of 15535542454321 is 12345424553551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10213847119921 + 5321695334400 = 3195911^2 + 2306880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15535542454321 is a prime.

It is not a weakly prime, because it can be changed into another prime (15535542454921) 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, 7767771227160 + 7767771227161.

It is an arithmetic number, because the mean of its divisors is an integer number (7767771227161).

Almost surely, 2^{15535542454321} is an apocalyptic number.

It is an amenable number.

15535542454321 is a deficient number, since it is larger than the sum of its proper divisors (1).

15535542454321 is an equidigital number, since it uses as much as digits as its factorization.

15535542454321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200000, while the sum is 49.

The spelling of 15535542454321 in words is "fifteen trillion, five hundred thirty-five billion, five hundred forty-two million, four hundred fifty-four thousand, three hundred twenty-one".