66171582050 has 54 divisors (see below), whose sum is σ = 143201251107. Its totient is φ = 22683034080.

The previous prime is 66171582011. The next prime is 66171582067. The reversal of 66171582050 is 5028517166.

It can be written as a sum of positive squares in 5 ways, for example, as 21152502721 + 45019079329 = 145439^2 + 212177^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=181895.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66171581989 and 66171582007.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 12730052 + ... + 12735248.

Almost surely, 2^66171582050 is an apocalyptic number.

66171582050 is an abundant number, since it is smaller than the sum of its proper divisors (77029669057).

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

66171582050 is an frugal number, since it uses more digits than its factorization.

66171582050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10420 (or 5211 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 41.

The spelling of 66171582050 in words is "sixty-six billion, one hundred seventy-one million, five hundred eighty-two thousand, fifty".