12773453778 has 54 divisors (see below), whose sum is σ = 29418343461. Its totient is φ = 4004800704.

The previous prime is 12773453753. The next prime is 12773453813. The reversal of 12773453778 is 87735437721.

12773453778 is a `hidden beast` number, since 1 + 2 + 7 + 7 + 34 + 537 + 78 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11690583129 + 1082870649 = 108123^2 + 32907^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=79917.

It is a super-2 number, since 2×12773453778² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8150751 + ... + 8152317.

Almost surely, 2^12773453778 is an apocalyptic number.

12773453778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12773453778

12773453778 is an abundant number, since it is smaller than the sum of its proper divisors (16644889683).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12773453778 is an equidigital number, since it uses as much as digits as its factorization.

12773453778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3176 (or 1589 counting only the distinct ones).

The product of its digits is 6914880, while the sum is 54.

The spelling of 12773453778 in words is "twelve billion, seven hundred seventy-three million, four hundred fifty-three thousand, seven hundred seventy-eight".