194199743761 has 3 divisors (see below), whose sum is σ = 194200184443. Its totient is φ = 194199303080.

The previous prime is 194199743747. The next prime is 194199743819. The reversal of 194199743761 is 167347991491.

The square root of 194199743761 is 440681.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 183082150161 + 11117593600 = 427881^2 + 105440^2 .

It is a de Polignac number, because none of the positive numbers 2^k-194199743761 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 194199743761.

It is not an unprimeable number, because it can be changed into a prime (194199743561) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 220341 + ... + 661021.

Almost surely, 2^194199743761 is an apocalyptic number.

194199743761 is the 440681-st square number.

194199743761 is the 220341-st centered octagonal number.

It is an amenable number.

194199743761 is a deficient number, since it is larger than the sum of its proper divisors (440682).

194199743761 is an frugal number, since it uses more digits than its factorization.

194199743761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881362 (or 440681 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 61.

The spelling of 194199743761 in words is "one hundred ninety-four billion, one hundred ninety-nine million, seven hundred forty-three thousand, seven hundred sixty-one".