7717376421 has 6 divisors (see below), whose sum is σ = 11147321510. Its totient is φ = 5144917608.

The previous prime is 7717376377. The next prime is 7717376473. The reversal of 7717376421 is 1246737177.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7700062500 + 17313921 = 87750^2 + 4161^2 .

It is not a de Polignac number, because 7717376421 - 2¹¹ = 7717374373 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 (7717376521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 428743126 + ... + 428743143.

Almost surely, 2^7717376421 is an apocalyptic number.

It is an amenable number.

7717376421 is a deficient number, since it is larger than the sum of its proper divisors (3429945089).

7717376421 is a wasteful number, since it uses less digits than its factorization.

7717376421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857486275 (or 857486272 counting only the distinct ones).

The product of its digits is 345744, while the sum is 45.

The square root of 7717376421 is about 87848.5994253750. The cubic root of 7717376421 is about 1976.1651125402.

The spelling of 7717376421 in words is "seven billion, seven hundred seventeen million, three hundred seventy-six thousand, four hundred twenty-one".