66197225898 has 24 divisors (see below), whose sum is σ = 148373093700. Its totient is φ = 21304854144.

The previous prime is 66197225879. The next prime is 66197225903. The reversal of 66197225898 is 89852279166.

66197225898 is a `hidden beast` number, since 6 + 619 + 7 + 2 + 2 + 5 + 8 + 9 + 8 = 666.

66197225898 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 64885844529 + 1311381369 = 254727^2 + 36213^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63406783 + ... + 63407826.

Almost surely, 2^66197225898 is an apocalyptic number.

66197225898 is an abundant number, since it is smaller than the sum of its proper divisors (82175867802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66197225898 is a wasteful number, since it uses less digits than its factorization.

66197225898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126814646 (or 126814643 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The spelling of 66197225898 in words is "sixty-six billion, one hundred ninety-seven million, two hundred twenty-five thousand, eight hundred ninety-eight".