1977168497 has 4 divisors (see below), whose sum is σ = 1981735140. Its totient is φ = 1972601856.

The previous prime is 1977168469. The next prime is 1977168511. The reversal of 1977168497 is 7948617791.

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 674752576 + 1302415921 = 25976^2 + 36089^2 .

It is a cyclic number.

It is not a de Polignac number, because 1977168497 - 2⁸ = 1977168241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1977168407) by changing a digit.

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, 2282672 + ... + 2283537.

It is an arithmetic number, because the mean of its divisors is an integer number (495433785).

Almost surely, 2^1977168497 is an apocalyptic number.

It is an amenable number.

1977168497 is a deficient number, since it is larger than the sum of its proper divisors (4566643).

1977168497 is an equidigital number, since it uses as much as digits as its factorization.

1977168497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4566642.

The product of its digits is 5334336, while the sum is 59.

The square root of 1977168497 is about 44465.3628906816. The cubic root of 1977168497 is about 1255.1083745292.

The spelling of 1977168497 in words is "one billion, nine hundred seventy-seven million, one hundred sixty-eight thousand, four hundred ninety-seven".