1234555556679 has 16 divisors (see below), whose sum is σ = 1830695055840. Its totient is φ = 822261300480.

The previous prime is 1234555556659. The next prime is 1234555556723. The reversal of 1234555556679 is 9766555554321.

1234555556679 is a `hidden beast` number, since 1 + 2 + 3 + 4 + 5 + 5 + 5 + 556 + 6 + 79 = 666.

It is not a de Polignac number, because 1234555556679 - 2²¹ = 1234553459527 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1234555556659) 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, 21519082 + ... + 21576375.

It is an arithmetic number, because the mean of its divisors is an integer number (114418440990).

Almost surely, 2^{1234555556679} is an apocalyptic number.

1234555556679 is a deficient number, since it is larger than the sum of its proper divisors (596139499161).

1234555556679 is a wasteful number, since it uses less digits than its factorization.

1234555556679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43096527 (or 43096521 counting only the distinct ones).

The product of its digits is 170100000, while the sum is 63.

The spelling of 1234555556679 in words is "one trillion, two hundred thirty-four billion, five hundred fifty-five million, five hundred fifty-six thousand, six hundred seventy-nine".