66502266651 has 8 divisors (see below), whose sum is σ = 98521876560. Its totient is φ = 44334844416.

The previous prime is 66502266637. The next prime is 66502266659. The reversal of 66502266651 is 15666220566.

It is a happy number.

It is not a de Polignac number, because 66502266651 - 2⁶ = 66502266587 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66502266597 and 66502266606.

It is not an unprimeable number, because it can be changed into a prime (66502266659) 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, 1231523430 + ... + 1231523483.

It is an arithmetic number, because the mean of its divisors is an integer number (12315234570).

Almost surely, 2^66502266651 is an apocalyptic number.

66502266651 is a deficient number, since it is larger than the sum of its proper divisors (32019609909).

66502266651 is a wasteful number, since it uses less digits than its factorization.

66502266651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2463046922 (or 2463046916 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 66502266651 in words is "sixty-six billion, five hundred two million, two hundred sixty-six thousand, six hundred fifty-one".