1556656147 has 4 divisors (see below), whose sum is σ = 1556737056. Its totient is φ = 1556575240.

The previous prime is 1556656109. The next prime is 1556656151. The reversal of 1556656147 is 7416566551.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1556656147 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1556656097 and 1556656106.

It is not an unprimeable number, because it can be changed into a prime (1556651147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6822 + ... + 56212.

It is an arithmetic number, because the mean of its divisors is an integer number (389184264).

Almost surely, 2^1556656147 is an apocalyptic number.

1556656147 is a deficient number, since it is larger than the sum of its proper divisors (80909).

1556656147 is an equidigital number, since it uses as much as digits as its factorization.

1556656147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80908.

The product of its digits is 756000, while the sum is 46.

The square root of 1556656147 is about 39454.4819633968. The cubic root of 1556656147 is about 1158.9487471017.

The spelling of 1556656147 in words is "one billion, five hundred fifty-six million, six hundred fifty-six thousand, one hundred forty-seven".