2660648664466 has 8 divisors (see below), whose sum is σ = 4297970919564. Its totient is φ = 1227991691280.

The previous prime is 2660648664461. The next prime is 2660648664511. The reversal of 2660648664466 is 6644668460662.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2186243174025 + 474405490441 = 1478595^2 + 688771^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 2660648664398 and 2660648664407.

It is not an unprimeable number, because it can be changed into a prime (2660648664461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51166320445 + ... + 51166320496.

Almost surely, 2^{2660648664466} is an apocalyptic number.

2660648664466 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2660648664466 is a deficient number, since it is larger than the sum of its proper divisors (1637322255098).

2660648664466 is a wasteful number, since it uses less digits than its factorization.

2660648664466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102332640956.

The product of its (nonzero) digits is 286654464, while the sum is 64.

The spelling of 2660648664466 in words is "two trillion, six hundred sixty billion, six hundred forty-eight million, six hundred sixty-four thousand, four hundred sixty-six".