1668133550 has 24 divisors (see below), whose sum is σ = 3155322600. Its totient is φ = 655942880.

The previous prime is 1668133543. The next prime is 1668133553. The reversal of 1668133550 is 553318661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668133553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 279785 + ... + 285684.

It is an arithmetic number, because the mean of its divisors is an integer number (131471775).

Almost surely, 2^1668133550 is an apocalyptic number.

1668133550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1668133550 is a deficient number, since it is larger than the sum of its proper divisors (1487189050).

1668133550 is a wasteful number, since it uses less digits than its factorization.

1668133550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565540 (or 565535 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 1668133550 is about 40842.7906735081. The cubic root of 1668133550 is about 1185.9788359999.

The spelling of 1668133550 in words is "one billion, six hundred sixty-eight million, one hundred thirty-three thousand, five hundred fifty".