1968149045 has 4 divisors (see below), whose sum is σ = 2361778860. Its totient is φ = 1574519232.

The previous prime is 1968149033. The next prime is 1968149059. The reversal of 1968149045 is 5409418691.

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

It can be written as a sum of positive squares in 2 ways, for example, as 432057796 + 1536091249 = 20786^2 + 39193^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1968149045 is a prime.

It is a super-2 number, since 2×1968149045² = 7747221326668824050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196814900 + ... + 196814909.

It is an arithmetic number, because the mean of its divisors is an integer number (590444715).

Almost surely, 2^1968149045 is an apocalyptic number.

It is an amenable number.

1968149045 is a deficient number, since it is larger than the sum of its proper divisors (393629815).

1968149045 is an equidigital number, since it uses as much as digits as its factorization.

1968149045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393629814.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 1968149045 is about 44363.8258607167. The cubic root of 1968149045 is about 1253.1969462572.

The spelling of 1968149045 in words is "one billion, nine hundred sixty-eight million, one hundred forty-nine thousand, forty-five".