66629692666 has 4 divisors (see below), whose sum is σ = 99944539002. Its totient is φ = 33314846332.

The previous prime is 66629692637. The next prime is 66629692667.

66629692666 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 35293258225 + 31336434441 = 187865^2 + 177021^2 .

It is a super-2 number, since 2×66629692666² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66629692598 and 66629692607.

It is not an unprimeable number, because it can be changed into a prime (66629692667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16657423165 + ... + 16657423168.

Almost surely, 2^66629692666 is an apocalyptic number.

66629692666 is a deficient number, since it is larger than the sum of its proper divisors (33314846336).

66629692666 is a wasteful number, since it uses less digits than its factorization.

66629692666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33314846335.

The product of its digits is 90699264, while the sum is 64.

The spelling of 66629692666 in words is "sixty-six billion, six hundred twenty-nine million, six hundred ninety-two thousand, six hundred sixty-six".