2156167556 has 6 divisors (see below), whose sum is σ = 3773293230. Its totient is φ = 1078083776.

The previous prime is 2156167553. The next prime is 2156167597. The reversal of 2156167556 is 6557616512.

It can be written as a sum of positive squares in only one way, i.e., 1134342400 + 1021825156 = 33680^2 + 31966^2 .

It is not an unprimeable number, because it can be changed into a prime (2156167553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269520941 + ... + 269520948.

It is an arithmetic number, because the mean of its divisors is an integer number (628882205).

Almost surely, 2^2156167556 is an apocalyptic number.

It is an amenable number.

2156167556 is a deficient number, since it is larger than the sum of its proper divisors (1617125674).

2156167556 is a wasteful number, since it uses less digits than its factorization.

2156167556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539041893 (or 539041891 counting only the distinct ones).

The product of its digits is 378000, while the sum is 44.

The square root of 2156167556 is about 46434.5513168804. The cubic root of 2156167556 is about 1291.8958475023.

The spelling of 2156167556 in words is "two billion, one hundred fifty-six million, one hundred sixty-seven thousand, five hundred fifty-six".