556945309621 has 8 divisors (see below), whose sum is σ = 559515793760. Its totient is φ = 554379737328.

The previous prime is 556945309573. The next prime is 556945309693. The reversal of 556945309621 is 126903549655.

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 556945309621 - 2³¹ = 554797825973 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 (556945109621) 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, 1000566 + ... + 1454311.

It is an arithmetic number, because the mean of its divisors is an integer number (69939474220).

Almost surely, 2^556945309621 is an apocalyptic number.

It is an amenable number.

556945309621 is a deficient number, since it is larger than the sum of its proper divisors (2570484139).

556945309621 is a wasteful number, since it uses less digits than its factorization.

556945309621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2455923.

The product of its (nonzero) digits is 8748000, while the sum is 55.

The spelling of 556945309621 in words is "five hundred fifty-six billion, nine hundred forty-five million, three hundred nine thousand, six hundred twenty-one".