12916865477 has 4 divisors (see below), whose sum is σ = 13035368940. Its totient is φ = 12798362016.

The previous prime is 12916865471. The next prime is 12916865539. The reversal of 12916865477 is 77456861921.

It is a happy number.

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 8744868196 + 4171997281 = 93514^2 + 64591^2 .

It is a cyclic number.

It is not a de Polignac number, because 12916865477 - 2¹⁴ = 12916849093 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 (12916865471) 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, 59251568 + ... + 59251785.

It is an arithmetic number, because the mean of its divisors is an integer number (3258842235).

Almost surely, 2^12916865477 is an apocalyptic number.

It is an amenable number.

12916865477 is a deficient number, since it is larger than the sum of its proper divisors (118503463).

12916865477 is a wasteful number, since it uses less digits than its factorization.

12916865477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118503462.

The product of its digits is 5080320, while the sum is 56.

The spelling of 12916865477 in words is "twelve billion, nine hundred sixteen million, eight hundred sixty-five thousand, four hundred seventy-seven".