555661440 has 96 divisors (see below), whose sum is σ = 1918788300. Its totient is φ = 148174848.

The previous prime is 555661369. The next prime is 555661471. The reversal of 555661440 is 44166555.

555661440 is a `hidden beast` number, since 5 + 556 + 61 + 4 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 527529024 + 28132416 = 22968^2 + 5304^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 555661395 and 555661404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42475 + ... + 53994.

Almost surely, 2^555661440 is an apocalyptic number.

It is an amenable number.

555661440 is an abundant number, since it is smaller than the sum of its proper divisors (1363126860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

555661440 is a wasteful number, since it uses less digits than its factorization.

555661440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96494 (or 96479 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 555661440 is about 23572.4720807980. The cubic root of 555661440 is about 822.1229148249.

The spelling of 555661440 in words is "five hundred fifty-five million, six hundred sixty-one thousand, four hundred forty".