556661387 has 8 divisors (see below), whose sum is σ = 595032480. Its totient is φ = 519471040.

The previous prime is 556661377. The next prime is 556661407. The reversal of 556661387 is 783166655.

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

It is a cyclic number.

It is not a de Polignac number, because 556661387 - 2⁶ = 556661323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (556661317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294212 + ... + 296097.

It is an arithmetic number, because the mean of its divisors is an integer number (74379060).

Almost surely, 2^556661387 is an apocalyptic number.

556661387 is a deficient number, since it is larger than the sum of its proper divisors (38371093).

556661387 is a wasteful number, since it uses less digits than its factorization.

556661387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590373.

The product of its digits is 907200, while the sum is 47.

The square root of 556661387 is about 23593.6726051711. The cubic root of 556661387 is about 822.6157729145.

The spelling of 556661387 in words is "five hundred fifty-six million, six hundred sixty-one thousand, three hundred eighty-seven".