1965918797 has 4 divisors (see below), whose sum is σ = 1998147036. Its totient is φ = 1933690560.

The previous prime is 1965918793. The next prime is 1965918803. The reversal of 1965918797 is 7978195691.

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 322346116 + 1643572681 = 17954^2 + 40541^2 .

It is a cyclic number.

It is not a de Polignac number, because 1965918797 - 2² = 1965918793 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 (1965918793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16114028 + ... + 16114149.

It is an arithmetic number, because the mean of its divisors is an integer number (499536759).

Almost surely, 2^1965918797 is an apocalyptic number.

It is an amenable number.

1965918797 is a deficient number, since it is larger than the sum of its proper divisors (32228239).

1965918797 is an equidigital number, since it uses as much as digits as its factorization.

1965918797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32228238.

The product of its digits is 8573040, while the sum is 62.

The square root of 1965918797 is about 44338.6828514335. The cubic root of 1965918797 is about 1252.7234055008.

The spelling of 1965918797 in words is "one billion, nine hundred sixty-five million, nine hundred eighteen thousand, seven hundred ninety-seven".