66815008770 has 32 divisors (see below), whose sum is σ = 160379108352. Its totient is φ = 17814770432.

The previous prime is 66815008697. The next prime is 66815008781. The reversal of 66815008770 is 7780051866.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56314 + ... + 369866.

It is an arithmetic number, because the mean of its divisors is an integer number (5011847136).

Almost surely, 2^66815008770 is an apocalyptic number.

66815008770 is an abundant number, since it is smaller than the sum of its proper divisors (93564099582).

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

66815008770 is a wasteful number, since it uses less digits than its factorization.

66815008770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320666.

The product of its (nonzero) digits is 564480, while the sum is 48.

The spelling of 66815008770 in words is "sixty-six billion, eight hundred fifteen million, eight thousand, seven hundred seventy".