12698760978 has 18 divisors (see below), whose sum is σ = 27515018037. Its totient is φ = 4232760960.

The previous prime is 12698760959. The next prime is 12698761057. The reversal of 12698760978 is 87906789621.

12698760978 is a `hidden beast` number, since 12 + 6 + 9 + 8 + 7 + 609 + 7 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10748920329 + 1949840649 = 103677^2 + 44157^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=79683.

It is a super-2 number, since 2×12698760978² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 464818 + ... + 491378.

Almost surely, 2^12698760978 is an apocalyptic number.

12698760978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12698760978 is an abundant number, since it is smaller than the sum of its proper divisors (14816257059).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12698760978 is an frugal number, since it uses more digits than its factorization.

12698760978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53130 (or 26566 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 63.

The spelling of 12698760978 in words is "twelve billion, six hundred ninety-eight million, seven hundred sixty thousand, nine hundred seventy-eight".