12078432657 has 6 divisors (see below), whose sum is σ = 17446624962. Its totient is φ = 8052288432.

The previous prime is 12078432649. The next prime is 12078432659. The reversal of 12078432657 is 75623487021.

12078432657 is a `hidden beast` number, since 1 + 207 + 8 + 432 + 6 + 5 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8444874816 + 3633557841 = 91896^2 + 60279^2 .

It is not a de Polignac number, because 12078432657 - 2³ = 12078432649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12078432659) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 671024028 + ... + 671024045.

It is an arithmetic number, because the mean of its divisors is an integer number (2907770827).

Almost surely, 2^12078432657 is an apocalyptic number.

It is an amenable number.

12078432657 is a deficient number, since it is larger than the sum of its proper divisors (5368192305).

12078432657 is a wasteful number, since it uses less digits than its factorization.

12078432657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342048079 (or 1342048076 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 12078432657 in words is "twelve billion, seventy-eight million, four hundred thirty-two thousand, six hundred fifty-seven".