66669293225 has 6 divisors (see below), whose sum is σ = 82669923630. Its totient is φ = 53335434560.

The previous prime is 66669293221. The next prime is 66669293231. The reversal of 66669293225 is 52239296666.

It can be written as a sum of positive squares in 3 ways, for example, as 50069776 + 66619223449 = 7076^2 + 258107^2 .

It is not a de Polignac number, because 66669293225 - 2² = 66669293221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66669293221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1333385840 + ... + 1333385889.

It is an arithmetic number, because the mean of its divisors is an integer number (13778320605).

Almost surely, 2^66669293225 is an apocalyptic number.

It is an amenable number.

66669293225 is a deficient number, since it is larger than the sum of its proper divisors (16000630405).

66669293225 is a wasteful number, since it uses less digits than its factorization.

66669293225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666771739 (or 2666771734 counting only the distinct ones).

The product of its digits is 12597120, while the sum is 56.

The spelling of 66669293225 in words is "sixty-six billion, six hundred sixty-nine million, two hundred ninety-three thousand, two hundred twenty-five".