654561556 has 48 divisors (see below), whose sum is σ = 1290627072. Its totient is φ = 287884800.

The previous prime is 654561553. The next prime is 654561569. The reversal of 654561556 is 655165456.

It is a super-2 number, since 2×654561556² = 856901661186282272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654561553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227680 + ... + 230536.

It is an arithmetic number, because the mean of its divisors is an integer number (26888064).

Almost surely, 2^654561556 is an apocalyptic number.

It is an amenable number.

654561556 is a deficient number, since it is larger than the sum of its proper divisors (636065516).

654561556 is a wasteful number, since it uses less digits than its factorization.

654561556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3040 (or 3038 counting only the distinct ones).

The product of its digits is 540000, while the sum is 43.

The square root of 654561556 is about 25584.4006378887. The cubic root of 654561556 is about 868.2607416038.

Adding to 654561556 its product of digits (540000), we get a palindrome (655101556).

The spelling of 654561556 in words is "six hundred fifty-four million, five hundred sixty-one thousand, five hundred fifty-six".