66821086707351 has 8 divisors (see below), whose sum is σ = 89094923723520. Its totient is φ = 44547320414712.

The previous prime is 66821086707341. The next prime is 66821086707359. The reversal of 66821086707351 is 15370768012866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66821086707351 - 2²¹ = 66821084610199 is a prime.

It is a super-3 number, since 3×66821086707351³ (a number of 42 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66821086707359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15435565 + ... + 19284678.

It is an arithmetic number, because the mean of its divisors is an integer number (11136865465440).

Almost surely, 2^{66821086707351} is an apocalyptic number.

66821086707351 is a deficient number, since it is larger than the sum of its proper divisors (22273837016169).

66821086707351 is a wasteful number, since it uses less digits than its factorization.

66821086707351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35361765.

The product of its (nonzero) digits is 20321280, while the sum is 60.

The spelling of 66821086707351 in words is "sixty-six trillion, eight hundred twenty-one billion, eighty-six million, seven hundred seven thousand, three hundred fifty-one".