66065660156500 has 24 divisors (see below), whose sum is σ = 144287401782888. Its totient is φ = 26426264062400.

The previous prime is 66065660156477. The next prime is 66065660156527. The reversal of 66065660156500 is 565106656066.

It can be written as a sum of positive squares in 4 ways, for example, as 1577500832196 + 64488159324304 = 1255986^2 + 8030452^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66065659657 + ... + 66065660656.

It is an arithmetic number, because the mean of its divisors is an integer number (6011975074287).

Almost surely, 2^{66065660156500} is an apocalyptic number.

It is an amenable number.

66065660156500 is an abundant number, since it is smaller than the sum of its proper divisors (78221741626388).

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

66065660156500 is a wasteful number, since it uses less digits than its factorization.

66065660156500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132131320332 (or 132131320320 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 52.

The spelling of 66065660156500 in words is "sixty-six trillion, sixty-five billion, six hundred sixty million, one hundred fifty-six thousand, five hundred".