1965381497979 has 16 divisors (see below), whose sum is σ = 2657611977984. Its totient is φ = 1291705380000.

The previous prime is 1965381497941. The next prime is 1965381498049. The reversal of 1965381497979 is 9797941835691.

It is not a de Polignac number, because 1965381497979 - 2¹⁹ = 1965380973691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1965381497579) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2636604 + ... + 3298854.

It is an arithmetic number, because the mean of its divisors is an integer number (166100748624).

Almost surely, 2^{1965381497979} is an apocalyptic number.

1965381497979 is a deficient number, since it is larger than the sum of its proper divisors (692230480005).

1965381497979 is a wasteful number, since it uses less digits than its factorization.

1965381497979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676258.

The product of its digits is 925888320, while the sum is 78.

The spelling of 1965381497979 in words is "one trillion, nine hundred sixty-five billion, three hundred eighty-one million, four hundred ninety-seven thousand, nine hundred seventy-nine".