556748639 has 4 divisors (see below), whose sum is σ = 557177880. Its totient is φ = 556319400.

The previous prime is 556748597. The next prime is 556748651. The reversal of 556748639 is 936847655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936847655 = 5 ⋅187369531.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556748639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556748039) 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, 212669 + ... + 215270.

It is an arithmetic number, because the mean of its divisors is an integer number (139294470).

Almost surely, 2^556748639 is an apocalyptic number.

556748639 is a deficient number, since it is larger than the sum of its proper divisors (429241).

556748639 is a wasteful number, since it uses less digits than its factorization.

556748639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429240.

The product of its digits is 5443200, while the sum is 53.

The square root of 556748639 is about 23595.5215877929. The cubic root of 556748639 is about 822.6587500417.

The spelling of 556748639 in words is "five hundred fifty-six million, seven hundred forty-eight thousand, six hundred thirty-nine".