66326420506 has 4 divisors (see below), whose sum is σ = 99489630762. Its totient is φ = 33163210252.

The previous prime is 66326420477. The next prime is 66326420551. The reversal of 66326420506 is 60502462366.

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

It can be written as a sum of positive squares in only one way, i.e., 36630514881 + 29695905625 = 191391^2 + 172325^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16581605125 + ... + 16581605128.

Almost surely, 2^66326420506 is an apocalyptic number.

66326420506 is a deficient number, since it is larger than the sum of its proper divisors (33163210256).

66326420506 is a wasteful number, since it uses less digits than its factorization.

66326420506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33163210255.

The product of its (nonzero) digits is 311040, while the sum is 40.

The spelling of 66326420506 in words is "sixty-six billion, three hundred twenty-six million, four hundred twenty thousand, five hundred six".