194774678401 has 4 divisors (see below), whose sum is σ = 195462928432. Its totient is φ = 194086428372.

The previous prime is 194774678387. The next prime is 194774678411. The reversal of 194774678401 is 104876477491.

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.

It is a cyclic number.

It is not a de Polignac number, because 194774678401 - 2²¹ = 194772581249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194774678411) 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, 344124591 + ... + 344125156.

It is an arithmetic number, because the mean of its divisors is an integer number (48865732108).

Almost surely, 2^194774678401 is an apocalyptic number.

It is an amenable number.

194774678401 is a deficient number, since it is larger than the sum of its proper divisors (688250031).

194774678401 is an equidigital number, since it uses as much as digits as its factorization.

194774678401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688250030.

The product of its (nonzero) digits is 9483264, while the sum is 58.

The spelling of 194774678401 in words is "one hundred ninety-four billion, seven hundred seventy-four million, six hundred seventy-eight thousand, four hundred one".