620866606668026 has 8 divisors (see below), whose sum is σ = 940520701190484. Its totient is φ = 307359706271200.

The previous prime is 620866606667971. The next prime is 620866606668029.

620866606668026 is nontrivially palindromic in base 10.

It is a Cunningham number, because it is equal to 24917195²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 620866606668025 + 1 = 24917195^2 + 1^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (620866606668029) 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, 1536798531155 + ... + 1536798531558.

Almost surely, 2^{620866606668026} is an apocalyptic number.

620866606668026 is a deficient number, since it is larger than the sum of its proper divisors (319654094522458).

620866606668026 is a wasteful number, since it uses less digits than its factorization.

620866606668026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3073597062816.

The product of its (nonzero) digits is 429981696, while the sum is 68.

The spelling of 620866606668026 in words is "six hundred twenty trillion, eight hundred sixty-six billion, six hundred six million, six hundred sixty-eight thousand, twenty-six".