65766665206690 has 64 divisors (see below), whose sum is σ = 140895954144000. Its totient is φ = 21624919577856.

The previous prime is 65766665206637. The next prime is 65766665206741. The reversal of 65766665206690 is 9660256666756.

It is a super-2 number, since 2×65766665206690² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (70).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108413544 + ... + 109018483.

It is an arithmetic number, because the mean of its divisors is an integer number (2201499283500).

Almost surely, 2^{65766665206690} is an apocalyptic number.

65766665206690 is an abundant number, since it is smaller than the sum of its proper divisors (75129288937310).

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

65766665206690 is a wasteful number, since it uses less digits than its factorization.

65766665206690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217432219.

The product of its (nonzero) digits is 881798400, while the sum is 70.

The spelling of 65766665206690 in words is "sixty-five trillion, seven hundred sixty-six billion, six hundred sixty-five million, two hundred six thousand, six hundred ninety".