66510005610 has 16 divisors (see below), whose sum is σ = 159624013536. Its totient is φ = 17736001488.

The previous prime is 66510005599. The next prime is 66510005623. The reversal of 66510005610 is 1650001566.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2217000187 = 66510005610 / (6 + 6 + 5 + 1 + 0 + 0 + 0 + 5 + 6 + 1 + 0).

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, 1108500064 + ... + 1108500123.

It is an arithmetic number, because the mean of its divisors is an integer number (9976500846).

Almost surely, 2^66510005610 is an apocalyptic number.

66510005610 is an abundant number, since it is smaller than the sum of its proper divisors (93114007926).

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

66510005610 is a wasteful number, since it uses less digits than its factorization.

66510005610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2217000197.

The product of its (nonzero) digits is 5400, while the sum is 30.

The spelling of 66510005610 in words is "sixty-six billion, five hundred ten million, five thousand, six hundred ten".