2154556688 has 20 divisors (see below), whose sum is σ = 4202474700. Its totient is φ = 1070047104.

The previous prime is 2154556643. The next prime is 2154556697. The reversal of 2154556688 is 8866554512.

It can be written as a sum of positive squares in 2 ways, for example, as 194546704 + 1960009984 = 13948^2 + 44272^2 .

It is a super-2 number, since 2×2154556688² = 9284229043611058688, which contains 22 as substring.

It is an unprimeable number.

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, 449495 + ... + 454262.

It is an arithmetic number, because the mean of its divisors is an integer number (210123735).

Almost surely, 2^2154556688 is an apocalyptic number.

It is an amenable number.

2154556688 is a deficient number, since it is larger than the sum of its proper divisors (2047918012).

2154556688 is a wasteful number, since it uses less digits than its factorization.

2154556688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903914 (or 903908 counting only the distinct ones).

The product of its digits is 2304000, while the sum is 50.

The square root of 2154556688 is about 46417.2025007971. The cubic root of 2154556688 is about 1291.5740431749.

The spelling of 2154556688 in words is "two billion, one hundred fifty-four million, five hundred fifty-six thousand, six hundred eighty-eight".