6315221765 has 4 divisors (see below), whose sum is σ = 7578266124. Its totient is φ = 5052177408.

The previous prime is 6315221723. The next prime is 6315221777. The reversal of 6315221765 is 5671225136.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4767350116 + 1547871649 = 69046^2 + 39343^2 .

It is a cyclic number.

It is not a de Polignac number, because 6315221765 - 2²⁰ = 6314173189 is a prime.

It is a super-2 number, since 2×6315221765² = 79764051882259430450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631522172 + ... + 631522181.

It is an arithmetic number, because the mean of its divisors is an integer number (1894566531).

Almost surely, 2^6315221765 is an apocalyptic number.

It is an amenable number.

6315221765 is a deficient number, since it is larger than the sum of its proper divisors (1263044359).

6315221765 is a wasteful number, since it uses less digits than its factorization.

6315221765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263044358.

The product of its digits is 75600, while the sum is 38.

The square root of 6315221765 is about 79468.3695881575. The cubic root of 6315221765 is about 1848.4010303756.

The spelling of 6315221765 in words is "six billion, three hundred fifteen million, two hundred twenty-one thousand, seven hundred sixty-five".