556641405531 has 8 divisors (see below), whose sum is σ = 824653934160. Its totient is φ = 371094270336.

The previous prime is 556641405521. The next prime is 556641405553. The reversal of 556641405531 is 135504146655.

556641405531 is a `hidden beast` number, since 5 + 56 + 6 + 4 + 1 + 40 + 553 + 1 = 666.

It is not a de Polignac number, because 556641405531 - 2¹³ = 556641397339 is a prime.

It is a super-2 number, since 2×556641405531² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (556641405521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10308174150 + ... + 10308174203.

It is an arithmetic number, because the mean of its divisors is an integer number (103081741770).

Almost surely, 2^556641405531 is an apocalyptic number.

556641405531 is a deficient number, since it is larger than the sum of its proper divisors (268012528629).

556641405531 is a wasteful number, since it uses less digits than its factorization.

556641405531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20616348362 (or 20616348356 counting only the distinct ones).

The product of its (nonzero) digits is 1080000, while the sum is 45.

It can be divided in two parts, 55664 and 1405531, that added together give a triangular number (1461195 = T₁₇₀₉).

The spelling of 556641405531 in words is "five hundred fifty-six billion, six hundred forty-one million, four hundred five thousand, five hundred thirty-one".