66211925210 has 32 divisors (see below), whose sum is σ = 126846047952. Its totient is φ = 24797675520.

The previous prime is 66211925203. The next prime is 66211925243. The reversal of 66211925210 is 1252911266.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 7140081001 + 59071844209 = 84499^2 + 243047^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 976211 + ... + 1041830.

Almost surely, 2^66211925210 is an apocalyptic number.

66211925210 is a deficient number, since it is larger than the sum of its proper divisors (60634122742).

66211925210 is a wasteful number, since it uses less digits than its factorization.

66211925210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2018258.

The product of its (nonzero) digits is 12960, while the sum is 35.

The spelling of 66211925210 in words is "sixty-six billion, two hundred eleven million, nine hundred twenty-five thousand, two hundred ten".