12654453778 has 16 divisors (see below), whose sum is σ = 20101311864. Its totient is φ = 5954129920.

The previous prime is 12654453767. The next prime is 12654453781. The reversal of 12654453778 is 87735445621.

It can be written as a sum of positive squares in 4 ways, for example, as 5324183089 + 7330270689 = 72967^2 + 85617^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233058 + ... + 282178.

Almost surely, 2^12654453778 is an apocalyptic number.

12654453778 is a deficient number, since it is larger than the sum of its proper divisors (7446858086).

12654453778 is a wasteful number, since it uses less digits than its factorization.

12654453778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56717.

The product of its digits is 5644800, while the sum is 52.

The spelling of 12654453778 in words is "twelve billion, six hundred fifty-four million, four hundred fifty-three thousand, seven hundred seventy-eight".