78752216645 has 8 divisors (see below), whose sum is σ = 96051884280. Its totient is φ = 61968957120.

The previous prime is 78752216567. The next prime is 78752216659. The reversal of 78752216645 is 54661225787.

It can be written as a sum of positive squares in 4 ways, for example, as 5255380036 + 73496836609 = 72494^2 + 271103^2 .

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

It is not a de Polignac number, because 78752216645 - 2²² = 78748022341 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129101690 + ... + 129102299.

It is an arithmetic number, because the mean of its divisors is an integer number (12006485535).

Almost surely, 2^78752216645 is an apocalyptic number.

It is an amenable number.

78752216645 is a deficient number, since it is larger than the sum of its proper divisors (17299667635).

78752216645 is a wasteful number, since it uses less digits than its factorization.

78752216645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258204055.

The product of its digits is 5644800, while the sum is 53.

The spelling of 78752216645 in words is "seventy-eight billion, seven hundred fifty-two million, two hundred sixteen thousand, six hundred forty-five".