1668778007 has 8 divisors (see below), whose sum is σ = 1827606480. Its totient is φ = 1514301120.

The previous prime is 1668778003. The next prime is 1668778031. The reversal of 1668778007 is 7008778661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1668778007 - 2² = 1668778003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668778003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1087094 + ... + 1088627.

It is an arithmetic number, because the mean of its divisors is an integer number (228450810).

Almost surely, 2^1668778007 is an apocalyptic number.

1668778007 is a deficient number, since it is larger than the sum of its proper divisors (158828473).

1668778007 is a wasteful number, since it uses less digits than its factorization.

1668778007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2175793.

The product of its (nonzero) digits is 790272, while the sum is 50.

The square root of 1668778007 is about 40850.6793945951. The cubic root of 1668778007 is about 1186.1315443881.

The spelling of 1668778007 in words is "one billion, six hundred sixty-eight million, seven hundred seventy-eight thousand, seven".