66216262325 has 12 divisors (see below), whose sum is σ = 82120379748. Its totient is φ = 52965129600.

The previous prime is 66216262313. The next prime is 66216262331. The reversal of 66216262325 is 52326261266.

It can be written as a sum of positive squares in 6 ways, for example, as 8194051441 + 58022210884 = 90521^2 + 240878^2 .

It is not a de Polignac number, because 66216262325 - 2⁴ = 66216262309 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 22562 + ... + 364611.

It is an arithmetic number, because the mean of its divisors is an integer number (6843364979).

Almost surely, 2^66216262325 is an apocalyptic number.

It is an amenable number.

66216262325 is a deficient number, since it is larger than the sum of its proper divisors (15904117423).

66216262325 is a wasteful number, since it uses less digits than its factorization.

66216262325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394024 (or 394019 counting only the distinct ones).

The product of its digits is 311040, while the sum is 41.

The spelling of 66216262325 in words is "sixty-six billion, two hundred sixteen million, two hundred sixty-two thousand, three hundred twenty-five".