194251669261 has 4 divisors (see below), whose sum is σ = 209194105372. Its totient is φ = 179309233152.

The previous prime is 194251669211. The next prime is 194251669279. The reversal of 194251669261 is 162966152491.

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

It can be written as a sum of positive squares in 2 ways, for example, as 89838672361 + 104412996900 = 299731^2 + 323130^2 .

It is a cyclic number.

It is not a de Polignac number, because 194251669261 - 2⁷ = 194251669133 is a prime.

It is a super-2 number, since 2×194251669261² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 194251669199 and 194251669208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194251669201) 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, 7471218036 + ... + 7471218061.

It is an arithmetic number, because the mean of its divisors is an integer number (52298526343).

Almost surely, 2^194251669261 is an apocalyptic number.

It is an amenable number.

194251669261 is a deficient number, since it is larger than the sum of its proper divisors (14942436111).

194251669261 is a wasteful number, since it uses less digits than its factorization.

194251669261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14942436110.

The product of its digits is 1399680, while the sum is 52.

The spelling of 194251669261 in words is "one hundred ninety-four billion, two hundred fifty-one million, six hundred sixty-nine thousand, two hundred sixty-one".