15542216381 has 2 divisors, whose sum is σ = 15542216382. Its totient is φ = 15542216380.

The previous prime is 15542216341. The next prime is 15542216383. The reversal of 15542216381 is 18361224551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12424669156 + 3117547225 = 111466^2 + 55835^2 .

It is a cyclic number.

It is not a de Polignac number, because 15542216381 - 2¹⁰ = 15542215357 is a prime.

It is a super-2 number, since 2×15542216381² (a number of 21 digits) contains 22 as substring.

Together with 15542216383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15542216383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7771108190 + 7771108191.

It is an arithmetic number, because the mean of its divisors is an integer number (7771108191).

Almost surely, 2^15542216381 is an apocalyptic number.

It is an amenable number.

15542216381 is a deficient number, since it is larger than the sum of its proper divisors (1).

15542216381 is an equidigital number, since it uses as much as digits as its factorization.

15542216381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57600, while the sum is 38.

The spelling of 15542216381 in words is "fifteen billion, five hundred forty-two million, two hundred sixteen thousand, three hundred eighty-one".