2157512668 has 24 divisors (see below), whose sum is σ = 3796015104. Its totient is φ = 1072950000.

The previous prime is 2157512639. The next prime is 2157512671. The reversal of 2157512668 is 8662157512.

It is a super-3 number, since 3×2157512668³ (a number of 29 digits) contains 333 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1154671 + ... + 1156537.

It is an arithmetic number, because the mean of its divisors is an integer number (158167296).

Almost surely, 2^2157512668 is an apocalyptic number.

It is an amenable number.

2157512668 is a deficient number, since it is larger than the sum of its proper divisors (1638502436).

2157512668 is a wasteful number, since it uses less digits than its factorization.

2157512668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3273 (or 3271 counting only the distinct ones).

The product of its digits is 201600, while the sum is 43.

The square root of 2157512668 is about 46449.0330146926. The cubic root of 2157512668 is about 1292.1644387762.

It can be divided in two parts, 21575 and 12668, that added together give a palindrome (34243).

The spelling of 2157512668 in words is "two billion, one hundred fifty-seven million, five hundred twelve thousand, six hundred sixty-eight".