6391779425 has 12 divisors (see below), whose sum is σ = 8392030956. Its totient is φ = 4812633600.

The previous prime is 6391779421. The next prime is 6391779439. The reversal of 6391779425 is 5249771936.

It can be written as a sum of positive squares in 6 ways, for example, as 96721 + 6391682704 = 311^2 + 79948^2 .

It is not a de Polignac number, because 6391779425 - 2² = 6391779421 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6391779421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7519316 + ... + 7520165.

It is an arithmetic number, because the mean of its divisors is an integer number (699335913).

Almost surely, 2^6391779425 is an apocalyptic number.

It is an amenable number.

6391779425 is a deficient number, since it is larger than the sum of its proper divisors (2000251531).

6391779425 is a wasteful number, since it uses less digits than its factorization.

6391779425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15039508 (or 15039503 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 53.

The square root of 6391779425 is about 79948.6048971463. The cubic root of 6391779425 is about 1855.8402651597.

The spelling of 6391779425 in words is "six billion, three hundred ninety-one million, seven hundred seventy-nine thousand, four hundred twenty-five".