194819926851 has 24 divisors (see below), whose sum is σ = 307698024816. Its totient is φ = 117799971840.

The previous prime is 194819926843. The next prime is 194819926871. The reversal of 194819926851 is 158629918491.

194819926851 is a `hidden beast` number, since 1 + 9 + 481 + 9 + 92 + 68 + 5 + 1 = 666.

It is not a de Polignac number, because 194819926851 - 2³ = 194819926843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (194819926831) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2229510 + ... + 2315243.

It is an arithmetic number, because the mean of its divisors is an integer number (12820751034).

Almost surely, 2^194819926851 is an apocalyptic number.

194819926851 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

194819926851 is a deficient number, since it is larger than the sum of its proper divisors (112878097965).

194819926851 is a wasteful number, since it uses less digits than its factorization.

194819926851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4545203 (or 4545200 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 63.

The spelling of 194819926851 in words is "one hundred ninety-four billion, eight hundred nineteen million, nine hundred twenty-six thousand, eight hundred fifty-one".