2168661357 has 40 divisors (see below), whose sum is σ = 3320456832. Its totient is φ = 1409918400.

The previous prime is 2168661343. The next prime is 2168661361. The reversal of 2168661357 is 7531668612.

2168661357 is a `hidden beast` number, since 21 + 6 + 8 + 6 + 613 + 5 + 7 = 666.

It is not a de Polignac number, because 2168661357 - 2¹¹ = 2168659309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2168661307) 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 39 ways as a sum of consecutive naturals, for example, 1259257 + ... + 1260977.

Almost surely, 2^2168661357 is an apocalyptic number.

2168661357 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2168661357 is a deficient number, since it is larger than the sum of its proper divisors (1151795475).

2168661357 is a wasteful number, since it uses less digits than its factorization.

2168661357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111 (or 2102 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 2168661357 is about 46568.8882946544. Note that the first 3 decimals coincide. The cubic root of 2168661357 is about 1294.3863178581.

The spelling of 2168661357 in words is "two billion, one hundred sixty-eight million, six hundred sixty-one thousand, three hundred fifty-seven".