838198161891838 has 64 divisors (see below), whose sum is σ = 1453542082211520. Its totient is φ = 358878793190400.

The previous prime is 838198161891791. The next prime is 838198161891847.

838198161891838 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×838198161891838² (a number of 31 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (82) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (82).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 954144856 + ... + 955022932.

It is an arithmetic number, because the mean of its divisors is an integer number (22711595034555).

Almost surely, 2^{838198161891838} is an apocalyptic number.

838198161891838 is a deficient number, since it is larger than the sum of its proper divisors (615343920319682).

838198161891838 is a wasteful number, since it uses less digits than its factorization.

838198161891838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914653.

The product of its digits is 1146617856, while the sum is 82.

The spelling of 838198161891838 in words is "eight hundred thirty-eight trillion, one hundred ninety-eight billion, one hundred sixty-one million, eight hundred ninety-one thousand, eight hundred thirty-eight".