66526660 has 24 divisors (see below), whose sum is σ = 142344216. Its totient is φ = 26108160.

The previous prime is 66526643. The next prime is 66526693. The reversal of 66526660 is 6662566.

It can be written as a sum of positive squares in 4 ways, for example, as 3069504 + 63457156 = 1752^2 + 7966^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

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, 30321 + ... + 32440.

It is an arithmetic number, because the mean of its divisors is an integer number (5931009).

Almost surely, 2^66526660 is an apocalyptic number.

It is an amenable number.

66526660 is an abundant number, since it is smaller than the sum of its proper divisors (75817556).

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

66526660 is a wasteful number, since it uses less digits than its factorization.

66526660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62823 (or 62821 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 66526660 is about 8156.3876808303. The cubic root of 66526660 is about 405.1960844927.

The spelling of 66526660 in words is "sixty-six million, five hundred twenty-six thousand, six hundred sixty".