77830398361 has 3 divisors (see below), whose sum is σ = 77830677343. Its totient is φ = 77830119380.

The previous prime is 77830398337. The next prime is 77830398419. The reversal of 77830398361 is 16389303877.

The square root of 77830398361 is 278981.

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., 26510026761 + 51320371600 = 162819^2 + 226540^2 .

It is not a de Polignac number, because 77830398361 - 2¹⁵ = 77830365593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77830398661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 139491 + ... + 418471.

Almost surely, 2^77830398361 is an apocalyptic number.

77830398361 is the 278981-st square number.

77830398361 is the 139491-st centered octagonal number.

It is an amenable number.

77830398361 is a deficient number, since it is larger than the sum of its proper divisors (278982).

77830398361 is an frugal number, since it uses more digits than its factorization.

77830398361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557962 (or 278981 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 55.

The spelling of 77830398361 in words is "seventy-seven billion, eight hundred thirty million, three hundred ninety-eight thousand, three hundred sixty-one".