194978838654 has 24 divisors (see below), whose sum is σ = 433871831640. Its totient is φ = 63236379888.

The previous prime is 194978838643. The next prime is 194978838709. The reversal of 194978838654 is 456838879491.

194978838654 is a `hidden beast` number, since 1 + 9 + 497 + 8 + 8 + 3 + 86 + 54 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146379844 + ... + 146381175.

It is an arithmetic number, because the mean of its divisors is an integer number (18077992985).

Almost surely, 2^194978838654 is an apocalyptic number.

194978838654 is an abundant number, since it is smaller than the sum of its proper divisors (238892992986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

194978838654 is a wasteful number, since it uses less digits than its factorization.

194978838654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292761064 (or 292761061 counting only the distinct ones).

The product of its digits is 418037760, while the sum is 72.

The spelling of 194978838654 in words is "one hundred ninety-four billion, nine hundred seventy-eight million, eight hundred thirty-eight thousand, six hundred fifty-four".