1234567777778 has 32 divisors (see below), whose sum is σ = 2016724176000. Its totient is φ = 564577050240.

The previous prime is 1234567777771. The next prime is 1234567777829. The reversal of 1234567777778 is 8777777654321.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1234567777771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13255838 + ... + 13348646.

It is an arithmetic number, because the mean of its divisors is an integer number (63022630500).

Almost surely, 2^{1234567777778} is an apocalyptic number.

1234567777778 is a deficient number, since it is larger than the sum of its proper divisors (782156398222).

1234567777778 is a wasteful number, since it uses less digits than its factorization.

1234567777778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104930.

The product of its digits is 677658240, while the sum is 71.

The spelling of 1234567777778 in words is "one trillion, two hundred thirty-four billion, five hundred sixty-seven million, seven hundred seventy-seven thousand, seven hundred seventy-eight".