6465257945 has 8 divisors (see below), whose sum is σ = 7759328136. Its totient is φ = 5171527296.

The previous prime is 6465257923. The next prime is 6465257971. The reversal of 6465257945 is 5497525646.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1174295824 + 5290962121 = 34268^2 + 72739^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6465257945 - 2¹² = 6465253849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40922 + ... + 120851.

It is an arithmetic number, because the mean of its divisors is an integer number (969916017).

Almost surely, 2^6465257945 is an apocalyptic number.

It is an amenable number.

6465257945 is a deficient number, since it is larger than the sum of its proper divisors (1294070191).

6465257945 is a wasteful number, since it uses less digits than its factorization.

6465257945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169771.

The product of its digits is 9072000, while the sum is 53.

The square root of 6465257945 is about 80406.8277262572. The cubic root of 6465257945 is about 1862.9246340177.

The spelling of 6465257945 in words is "six billion, four hundred sixty-five million, two hundred fifty-seven thousand, nine hundred forty-five".