2646666004 has 6 divisors (see below), whose sum is σ = 4631665514. Its totient is φ = 1323333000.

The previous prime is 2646665977. The next prime is 2646666007. The reversal of 2646666004 is 4006666462.

It can be written as a sum of positive squares in only one way, i.e., 2636617104 + 10048900 = 51348^2 + 3170^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2646666007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330833247 + ... + 330833254.

Almost surely, 2^2646666004 is an apocalyptic number.

It is an amenable number.

2646666004 is a deficient number, since it is larger than the sum of its proper divisors (1984999510).

2646666004 is a wasteful number, since it uses less digits than its factorization.

2646666004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661666505 (or 661666503 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 40.

The square root of 2646666004 is about 51445.7578814813. The cubic root of 2646666004 is about 1383.2469235747.

The spelling of 2646666004 in words is "two billion, six hundred forty-six million, six hundred sixty-six thousand, four".