1001668778 has 8 divisors (see below), whose sum is σ = 1639094400. Its totient is φ = 455303980.

The previous prime is 1001668777. The next prime is 1001668793. The reversal of 1001668778 is 8778661001.

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

It is not an unprimeable number, because it can be changed into a prime (1001668777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22765178 + ... + 22765221.

It is an arithmetic number, because the mean of its divisors is an integer number (204886800).

Almost surely, 2^1001668778 is an apocalyptic number.

1001668778 is a deficient number, since it is larger than the sum of its proper divisors (637425622).

1001668778 is a wasteful number, since it uses less digits than its factorization.

1001668778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45530412.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 1001668778 is about 31649.1512998374. The cubic root of 1001668778 is about 1000.5559501954. Note that the first 3 decimals are identical.

The spelling of 1001668778 in words is "one billion, one million, six hundred sixty-eight thousand, seven hundred seventy-eight".