42120504779 has 4 divisors (see below), whose sum is σ = 42121535880. Its totient is φ = 42119473680.

The previous prime is 42120504761. The next prime is 42120504821. The reversal of 42120504779 is 97740502124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42120504779 - 2²⁴ = 42103727563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42120504709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451634 + ... + 536855.

It is an arithmetic number, because the mean of its divisors is an integer number (10530383970).

Almost surely, 2^42120504779 is an apocalyptic number.

42120504779 is a deficient number, since it is larger than the sum of its proper divisors (1031101).

42120504779 is an equidigital number, since it uses as much as digits as its factorization.

42120504779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031100.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 42120504779 in words is "forty-two billion, one hundred twenty million, five hundred four thousand, seven hundred seventy-nine".