7780216216826 has 8 divisors (see below), whose sum is σ = 11682726373044. Its totient is φ = 3885974092480.

The previous prime is 7780216216819. The next prime is 7780216216847. The reversal of 7780216216826 is 6286126120877.

It can be written as a sum of positive squares in 2 ways, for example, as 7096123461025 + 684092755801 = 2663855^2 + 827099^2 .

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

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, 2067005615 + ... + 2067009378.

Almost surely, 2^{7780216216826} is an apocalyptic number.

7780216216826 is a deficient number, since it is larger than the sum of its proper divisors (3902510156218).

7780216216826 is a wasteful number, since it uses less digits than its factorization.

7780216216826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4134015936.

The product of its (nonzero) digits is 5419008, while the sum is 56.

The spelling of 7780216216826 in words is "seven trillion, seven hundred eighty billion, two hundred sixteen million, two hundred sixteen thousand, eight hundred twenty-six".