665840766510 has 64 divisors (see below), whose sum is σ = 1778983767360. Its totient is φ = 177216698880.

The previous prime is 665840766497. The next prime is 665840766593. The reversal of 665840766510 is 15667048566.

665840766510 is a `hidden beast` number, since 6 + 6 + 58 + 4 + 0 + 76 + 6 + 510 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2226007 + ... + 2507346.

It is an arithmetic number, because the mean of its divisors is an integer number (27796621365).

Almost surely, 2^665840766510 is an apocalyptic number.

665840766510 is an abundant number, since it is smaller than the sum of its proper divisors (1113143000850).

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

665840766510 is a wasteful number, since it uses less digits than its factorization.

665840766510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4733890 (or 4733884 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 54.

The spelling of 665840766510 in words is "six hundred sixty-five billion, eight hundred forty million, seven hundred sixty-six thousand, five hundred ten".