1977966163 has 4 divisors (see below), whose sum is σ = 1978615408. Its totient is φ = 1977316920.

The previous prime is 1977966149. The next prime is 1977966169. The reversal of 1977966163 is 3616697791.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1977966163 - 2¹⁷ = 1977835091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1977966169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320031 + ... + 326152.

It is an arithmetic number, because the mean of its divisors is an integer number (494653852).

Almost surely, 2^1977966163 is an apocalyptic number.

1977966163 is a deficient number, since it is larger than the sum of its proper divisors (649245).

1977966163 is an equidigital number, since it uses as much as digits as its factorization.

1977966163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649244.

The product of its digits is 2571912, while the sum is 55.

The square root of 1977966163 is about 44474.3315070615. The cubic root of 1977966163 is about 1255.2771382054.

The spelling of 1977966163 in words is "one billion, nine hundred seventy-seven million, nine hundred sixty-six thousand, one hundred sixty-three".