12378187657 has 8 divisors (see below), whose sum is σ = 13551196320. Its totient is φ = 11213132160.

The previous prime is 12378187639. The next prime is 12378187663. The reversal of 12378187657 is 75678187321.

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

It is a cyclic number.

It is not a de Polignac number, because 12378187657 - 2²⁷ = 12243969929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12378187598 and 12378187607.

It is not an unprimeable number, because it can be changed into a prime (12378187667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1985032 + ... + 1991257.

It is an arithmetic number, because the mean of its divisors is an integer number (1693899540).

Almost surely, 2^12378187657 is an apocalyptic number.

It is an amenable number.

12378187657 is a deficient number, since it is larger than the sum of its proper divisors (1173008663).

12378187657 is a wasteful number, since it uses less digits than its factorization.

12378187657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3976583.

The product of its digits is 3951360, while the sum is 55.

The spelling of 12378187657 in words is "twelve billion, three hundred seventy-eight million, one hundred eighty-seven thousand, six hundred fifty-seven".