15505381661422 has 4 divisors (see below), whose sum is σ = 23258072492136. Its totient is φ = 7752690830710.

The previous prime is 15505381661389. The next prime is 15505381661423. The reversal of 15505381661422 is 22416618350551.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×15505381661422² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15505381661423) 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, 3876345415354 + ... + 3876345415357.

It is an arithmetic number, because the mean of its divisors is an integer number (5814518123034).

Almost surely, 2^{15505381661422} is an apocalyptic number.

15505381661422 is a deficient number, since it is larger than the sum of its proper divisors (7752690830714).

15505381661422 is an equidigital number, since it uses as much as digits as its factorization.

15505381661422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7752690830713.

The product of its (nonzero) digits is 1728000, while the sum is 49.

The spelling of 15505381661422 in words is "fifteen trillion, five hundred five billion, three hundred eighty-one million, six hundred sixty-one thousand, four hundred twenty-two".