66715251766 has 8 divisors (see below), whose sum is σ = 100074165840. Its totient is φ = 33357196488.

The previous prime is 66715251751. The next prime is 66715251791.

66715251766 is nontrivially palindromic in base 10.

66715251766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×66715251766² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39895 + ... + 367453.

It is an arithmetic number, because the mean of its divisors is an integer number (12509270730).

Almost surely, 2^66715251766 is an apocalyptic number.

66715251766 is a deficient number, since it is larger than the sum of its proper divisors (33358914074).

66715251766 is a wasteful number, since it uses less digits than its factorization.

66715251766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429398.

The product of its digits is 3175200, while the sum is 52.

The spelling of 66715251766 in words is "sixty-six billion, seven hundred fifteen million, two hundred fifty-one thousand, seven hundred sixty-six".