2551166446 has 4 divisors (see below), whose sum is σ = 3826749672. Its totient is φ = 1275583222.

The previous prime is 2551166441. The next prime is 2551166459. The reversal of 2551166446 is 6446611552.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 2551166399 and 2551166408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551166441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637791610 + ... + 637791613.

It is an arithmetic number, because the mean of its divisors is an integer number (956687418).

Almost surely, 2^2551166446 is an apocalyptic number.

2551166446 is a deficient number, since it is larger than the sum of its proper divisors (1275583226).

2551166446 is a wasteful number, since it uses less digits than its factorization.

2551166446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275583225.

The product of its digits is 172800, while the sum is 40.

The square root of 2551166446 is about 50509.0729077460. The cubic root of 2551166446 is about 1366.4054893994.

Adding to 2551166446 its reverse (6446611552), we get a palindrome (8997777998).

The spelling of 2551166446 in words is "two billion, five hundred fifty-one million, one hundred sixty-six thousand, four hundred forty-six".