12699682778 has 8 divisors (see below), whose sum is σ = 19081978272. Its totient is φ = 6339023356.

The previous prime is 12699682777. The next prime is 12699682819. The reversal of 12699682778 is 87728699621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×12699682778² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12699682777) 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, 5407550 + ... + 5409897.

It is an arithmetic number, because the mean of its divisors is an integer number (2385247284).

Almost surely, 2^12699682778 is an apocalyptic number.

12699682778 is a deficient number, since it is larger than the sum of its proper divisors (6382295494).

12699682778 is a wasteful number, since it uses less digits than its factorization.

12699682778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10818036.

The product of its digits is 36578304, while the sum is 65.

The spelling of 12699682778 in words is "twelve billion, six hundred ninety-nine million, six hundred eighty-two thousand, seven hundred seventy-eight".