6156561556 has 6 divisors (see below), whose sum is σ = 10773982730. Its totient is φ = 3078280776.

The previous prime is 6156561539. The next prime is 6156561569. The reversal of 6156561556 is 6551656516.

It can be written as a sum of positive squares in only one way, i.e., 4853351556 + 1303210000 = 69666^2 + 36100^2 .

It is a super-2 number, since 2×6156561556² = 75806500385634282272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 769570191 + ... + 769570198.

Almost surely, 2^6156561556 is an apocalyptic number.

It is an amenable number.

6156561556 is a deficient number, since it is larger than the sum of its proper divisors (4617421174).

6156561556 is a wasteful number, since it uses less digits than its factorization.

6156561556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539140393 (or 1539140391 counting only the distinct ones).

The product of its digits is 810000, while the sum is 46.

The square root of 6156561556 is about 78463.7595071763. The cubic root of 6156561556 is about 1832.7901495008.

The spelling of 6156561556 in words is "six billion, one hundred fifty-six million, five hundred sixty-one thousand, five hundred fifty-six".