16541550394 has 4 divisors (see below), whose sum is σ = 24812325594. Its totient is φ = 8270775196.

The previous prime is 16541550379. The next prime is 16541550397. The reversal of 16541550394 is 49305514561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49305514561 = 643 ⋅76680427.

It can be written as a sum of positive squares in only one way, i.e., 16426267225 + 115283169 = 128165^2 + 10737^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16541550394.

It is not an unprimeable number, because it can be changed into a prime (16541550397) 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, 4135387597 + ... + 4135387600.

Almost surely, 2^16541550394 is an apocalyptic number.

16541550394 is a deficient number, since it is larger than the sum of its proper divisors (8270775200).

16541550394 is an equidigital number, since it uses as much as digits as its factorization.

16541550394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8270775199.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 16541550394 in words is "sixteen billion, five hundred forty-one million, five hundred fifty thousand, three hundred ninety-four".