1668778058 has 4 divisors (see below), whose sum is σ = 2503167090. Its totient is φ = 834389028.

The previous prime is 1668778043. The next prime is 1668778079. The reversal of 1668778058 is 8508778661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1537973089 + 130804969 = 39217^2 + 11437^2 .

It is a super-3 number, since 3×1668778058³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1668777994 and 1668778012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417194513 + ... + 417194516.

Almost surely, 2^1668778058 is an apocalyptic number.

1668778058 is a deficient number, since it is larger than the sum of its proper divisors (834389032).

1668778058 is an equidigital number, since it uses as much as digits as its factorization.

1668778058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834389031.

The product of its (nonzero) digits is 4515840, while the sum is 56.

The square root of 1668778058 is about 40850.6800188198. The cubic root of 1668778058 is about 1186.1315564713.

The spelling of 1668778058 in words is "one billion, six hundred sixty-eight million, seven hundred seventy-eight thousand, fifty-eight".