6646772776466 has 4 divisors (see below), whose sum is σ = 9970159164702. Its totient is φ = 3323386388232.

The previous prime is 6646772776417. The next prime is 6646772776471.

6646772776466 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., 6296511211225 + 350261565241 = 2509285^2 + 591829^2 .

It is a super-3 number, since 3×6646772776466³ (a number of 39 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6646772776393 and 6646772776402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1661693194115 + ... + 1661693194118.

Almost surely, 2^{6646772776466} is an apocalyptic number.

6646772776466 is a deficient number, since it is larger than the sum of its proper divisors (3323386388236).

6646772776466 is a wasteful number, since it uses less digits than its factorization.

6646772776466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3323386388235.

The product of its digits is 3584673792, while the sum is 74.

The spelling of 6646772776466 in words is "six trillion, six hundred forty-six billion, seven hundred seventy-two million, seven hundred seventy-six thousand, four hundred sixty-six".