19960978965 has 16 divisors (see below), whose sum is σ = 31944317568. Its totient is φ = 10643605056.

The previous prime is 19960978937. The next prime is 19960978969. The reversal of 19960978965 is 56987906991.

It is not a de Polignac number, because 19960978965 - 2¹⁵ = 19960946197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19960978965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19960978969) 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, 66049 + ... + 210438.

It is an arithmetic number, because the mean of its divisors is an integer number (1996519848).

Almost surely, 2^19960978965 is an apocalyptic number.

19960978965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19960978965 is a deficient number, since it is larger than the sum of its proper divisors (11983338603).

19960978965 is a wasteful number, since it uses less digits than its factorization.

19960978965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281308.

The product of its (nonzero) digits is 66134880, while the sum is 69.

The spelling of 19960978965 in words is "nineteen billion, nine hundred sixty million, nine hundred seventy-eight thousand, nine hundred sixty-five".