1278545734107 has 24 divisors (see below), whose sum is σ = 1898002201680. Its totient is φ = 828758226240.

The previous prime is 1278545734091. The next prime is 1278545734159. The reversal of 1278545734107 is 7014375458721.

1278545734107 is a `hidden beast` number, since 1 + 2 + 7 + 8 + 54 + 573 + 4 + 10 + 7 = 666.

It is not a de Polignac number, because 1278545734107 - 2⁴ = 1278545734091 is a prime.

It is a super-4 number, since 4×1278545734107⁴ (a number of 50 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (1278545744107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 829944 + ... + 1801637.

It is an arithmetic number, because the mean of its divisors is an integer number (79083425070).

Almost surely, 2^{1278545734107} is an apocalyptic number.

1278545734107 is a deficient number, since it is larger than the sum of its proper divisors (619456467573).

1278545734107 is a wasteful number, since it uses less digits than its factorization.

1278545734107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2633083 (or 2633080 counting only the distinct ones).

The product of its (nonzero) digits is 6585600, while the sum is 54.

The spelling of 1278545734107 in words is "one trillion, two hundred seventy-eight billion, five hundred forty-five million, seven hundred thirty-four thousand, one hundred seven".