19838198216461 has 4 divisors (see below), whose sum is σ = 19842163481952. Its totient is φ = 19834232950972.

The previous prime is 19838198216413. The next prime is 19838198216479. The reversal of 19838198216461 is 16461289183891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19838198216461 - 2⁴¹ = 17639174960909 is a prime.

It is a super-4 number, since 4×19838198216461⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19838198216561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1982625241 + ... + 1982635246.

It is an arithmetic number, because the mean of its divisors is an integer number (4960540870488).

Almost surely, 2^{19838198216461} is an apocalyptic number.

It is an amenable number.

19838198216461 is a deficient number, since it is larger than the sum of its proper divisors (3965265491).

19838198216461 is an equidigital number, since it uses as much as digits as its factorization.

19838198216461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3965265490.

The product of its digits is 35831808, while the sum is 67.

The spelling of 19838198216461 in words is "nineteen trillion, eight hundred thirty-eight billion, one hundred ninety-eight million, two hundred sixteen thousand, four hundred sixty-one".