66928199425 has 12 divisors (see below), whose sum is σ = 85668096256. Its totient is φ = 51815379600.

The previous prime is 66928199423. The next prime is 66928199461. The reversal of 66928199425 is 52499182966.

66928199425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66928199425 - 2¹ = 66928199423 is a prime.

It is a hoax number, since the sum of its digits (61) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (66928199423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43178709 + ... + 43180258.

Almost surely, 2^66928199425 is an apocalyptic number.

It is an amenable number.

66928199425 is a deficient number, since it is larger than the sum of its proper divisors (18739896831).

66928199425 is a wasteful number, since it uses less digits than its factorization.

66928199425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86359008 (or 86359003 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 61.

The spelling of 66928199425 in words is "sixty-six billion, nine hundred twenty-eight million, one hundred ninety-nine thousand, four hundred twenty-five".