194245691709 has 4 divisors (see below), whose sum is σ = 258994255616. Its totient is φ = 129497127804.

The previous prime is 194245691699. The next prime is 194245691719. The reversal of 194245691709 is 907196542491.

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: 907196542491 = 3 ⋅302398847497.

It is an interprime number because it is at equal distance from previous prime (194245691699) and next prime (194245691719).

It is not a de Polignac number, because 194245691709 - 2⁴ = 194245691693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194245691719) 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, 32374281949 + ... + 32374281954.

It is an arithmetic number, because the mean of its divisors is an integer number (64748563904).

Almost surely, 2^194245691709 is an apocalyptic number.

It is an amenable number.

194245691709 is a deficient number, since it is larger than the sum of its proper divisors (64748563907).

194245691709 is an equidigital number, since it uses as much as digits as its factorization.

194245691709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64748563906.

The product of its (nonzero) digits is 4898880, while the sum is 57.

The spelling of 194245691709 in words is "one hundred ninety-four billion, two hundred forty-five million, six hundred ninety-one thousand, seven hundred nine".