2152665556 has 6 divisors (see below), whose sum is σ = 3767164730. Its totient is φ = 1076332776.

The previous prime is 2152665551. The next prime is 2152665589. The reversal of 2152665556 is 6555662512.

It can be written as a sum of positive squares in only one way, i.e., 2148322500 + 4343056 = 46350^2 + 2084^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2152665551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269083191 + ... + 269083198.

Almost surely, 2^2152665556 is an apocalyptic number.

It is an amenable number.

2152665556 is a deficient number, since it is larger than the sum of its proper divisors (1614499174).

2152665556 is a wasteful number, since it uses less digits than its factorization.

2152665556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538166393 (or 538166391 counting only the distinct ones).

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

The square root of 2152665556 is about 46396.8270035786. The cubic root of 2152665556 is about 1291.1960455416.

The spelling of 2152665556 in words is "two billion, one hundred fifty-two million, six hundred sixty-five thousand, five hundred fifty-six".