2551566646 has 8 divisors (see below), whose sum is σ = 3838380840. Its totient is φ = 1272106368.

The previous prime is 2551566613. The next prime is 2551566659. The reversal of 2551566646 is 6466651552.

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 = 2551566596 and 2551566605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1837611 + ... + 1838998.

It is an arithmetic number, because the mean of its divisors is an integer number (479797605).

Almost surely, 2^2551566646 is an apocalyptic number.

2551566646 is a deficient number, since it is larger than the sum of its proper divisors (1286814194).

2551566646 is a wasteful number, since it uses less digits than its factorization.

2551566646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3676958.

The product of its digits is 1296000, while the sum is 46.

The square root of 2551566646 is about 50513.0344168711. The cubic root of 2551566646 is about 1366.4769347424.

The spelling of 2551566646 in words is "two billion, five hundred fifty-one million, five hundred sixty-six thousand, six hundred forty-six".