66530216517250 has 32 divisors (see below), whose sum is σ = 125380434956400. Its totient is φ = 26433481984000.

The previous prime is 66530216517239. The next prime is 66530216517257. The reversal of 66530216517250 is 5271561203566.

It can be written as a sum of positive squares in 8 ways, for example, as 4444216313161 + 62086000204089 = 2108131^2 + 7879467^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66530216517194 and 66530216517203.

It is not an unprimeable number, because it can be changed into a prime (66530216517257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 892985791 + ... + 893060290.

Almost surely, 2^{66530216517250} is an apocalyptic number.

66530216517250 is a deficient number, since it is larger than the sum of its proper divisors (58850218439150).

66530216517250 is a wasteful number, since it uses less digits than its factorization.

66530216517250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1786046247 (or 1786046237 counting only the distinct ones).

The product of its (nonzero) digits is 2268000, while the sum is 49.

The spelling of 66530216517250 in words is "sixty-six trillion, five hundred thirty billion, two hundred sixteen million, five hundred seventeen thousand, two hundred fifty".