1978067663 has 8 divisors (see below), whose sum is σ = 2323883856. Its totient is φ = 1659916800.

The previous prime is 1978067633. The next prime is 1978067681. The reversal of 1978067663 is 3667608791.

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 1978067663 - 2²⁸ = 1709632207 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 (1978067633) 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, 6916178 + ... + 6916463.

It is an arithmetic number, because the mean of its divisors is an integer number (290485482).

Almost surely, 2^1978067663 is an apocalyptic number.

1978067663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1978067663 is a deficient number, since it is larger than the sum of its proper divisors (345816193).

1978067663 is a wasteful number, since it uses less digits than its factorization.

1978067663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13832665.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 1978067663 is about 44475.4726000748. The cubic root of 1978067663 is about 1255.2986094945.

The spelling of 1978067663 in words is "one billion, nine hundred seventy-eight million, sixty-seven thousand, six hundred sixty-three".