8465780875649 has 4 divisors (see below), whose sum is σ = 8465950062036. Its totient is φ = 8465611689264.

The previous prime is 8465780875619. The next prime is 8465780875679. The reversal of 8465780875649 is 9465780875648.

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

It is an interprime number because it is at equal distance from previous prime (8465780875619) and next prime (8465780875679).

It can be written as a sum of positive squares in 2 ways, for example, as 7907383368049 + 558397507600 = 2812007^2 + 747260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8465780875649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8465780875649.

It is not an unprimeable number, because it can be changed into a prime (8465780875619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84518114 + ... + 84618219.

It is an arithmetic number, because the mean of its divisors is an integer number (2116487515509).

Almost surely, 2^{8465780875649} is an apocalyptic number.

It is an amenable number.

8465780875649 is a deficient number, since it is larger than the sum of its proper divisors (169186387).

8465780875649 is a wasteful number, since it uses less digits than its factorization.

8465780875649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169186386.

The product of its (nonzero) digits is 3251404800, while the sum is 77.

Subtracting 8465780875649 from its reverse (9465780875648), we obtain a palindrome (999999999999).

The spelling of 8465780875649 in words is "eight trillion, four hundred sixty-five billion, seven hundred eighty million, eight hundred seventy-five thousand, six hundred forty-nine".