551863646 has 4 divisors (see below), whose sum is σ = 827795472. Its totient is φ = 275931822.

The previous prime is 551863589. The next prime is 551863661. The reversal of 551863646 is 646368155.

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

It is a junction number, because it is equal to n+sod(n) for n = 551863597 and 551863606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137965910 + ... + 137965913.

It is an arithmetic number, because the mean of its divisors is an integer number (206948868).

Almost surely, 2^551863646 is an apocalyptic number.

551863646 is a deficient number, since it is larger than the sum of its proper divisors (275931826).

551863646 is a wasteful number, since it uses less digits than its factorization.

551863646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275931825.

The product of its digits is 518400, while the sum is 44.

The square root of 551863646 is about 23491.7782638948. The cubic root of 551863646 is about 820.2456363056.

The spelling of 551863646 in words is "five hundred fifty-one million, eight hundred sixty-three thousand, six hundred forty-six".