15534520051381 has 2 divisors, whose sum is σ = 15534520051382. Its totient is φ = 15534520051380.

The previous prime is 15534520051373. The next prime is 15534520051429. The reversal of 15534520051381 is 18315002543551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15526429048881 + 8091002500 = 3940359^2 + 89950^2 .

It is a cyclic number.

It is not a de Polignac number, because 15534520051381 - 2³ = 15534520051373 is a prime.

It is a super-2 number, since 2×15534520051381² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15534520051081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7767260025690 + 7767260025691.

It is an arithmetic number, because the mean of its divisors is an integer number (7767260025691).

Almost surely, 2^{15534520051381} is an apocalyptic number.

It is an amenable number.

15534520051381 is a deficient number, since it is larger than the sum of its proper divisors (1).

15534520051381 is an equidigital number, since it uses as much as digits as its factorization.

15534520051381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360000, while the sum is 43.

The spelling of 15534520051381 in words is "fifteen trillion, five hundred thirty-four billion, five hundred twenty million, fifty-one thousand, three hundred eighty-one".