66420820846426 has 16 divisors (see below), whose sum is σ = 99725392189800. Its totient is φ = 33179026940928.

The previous prime is 66420820846403. The next prime is 66420820846493. The reversal of 66420820846426 is 62464802802466.

It can be written as a sum of positive squares in 4 ways, for example, as 63387472640625 + 3033348205801 = 7961625^2 + 1741651^2 .

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, 37587786 + ... + 39315178.

Almost surely, 2^{66420820846426} is an apocalyptic number.

66420820846426 is a deficient number, since it is larger than the sum of its proper divisors (33304571343374).

66420820846426 is a wasteful number, since it uses less digits than its factorization.

66420820846426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745553.

The product of its (nonzero) digits is 42467328, while the sum is 58.

The spelling of 66420820846426 in words is "sixty-six trillion, four hundred twenty billion, eight hundred twenty million, eight hundred forty-six thousand, four hundred twenty-six".