196191615181 has 4 divisors (see below), whose sum is σ = 196591191264. Its totient is φ = 195792039100.

The previous prime is 196191615173. The next prime is 196191615247. The reversal of 196191615181 is 181516191691.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 181516191691 = 13313 ⋅13634507.

It is a cyclic number.

It is not a de Polignac number, because 196191615181 - 2³ = 196191615173 is a prime.

It is a super-2 number, since 2×196191615181² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196191615881) 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, 199787305 + ... + 199788286.

It is an arithmetic number, because the mean of its divisors is an integer number (49147797816).

Almost surely, 2^196191615181 is an apocalyptic number.

It is an amenable number.

196191615181 is a deficient number, since it is larger than the sum of its proper divisors (399576083).

196191615181 is an equidigital number, since it uses as much as digits as its factorization.

196191615181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399576082.

The product of its digits is 116640, while the sum is 49.

The spelling of 196191615181 in words is "one hundred ninety-six billion, one hundred ninety-one million, six hundred fifteen thousand, one hundred eighty-one".