42156555605 has 4 divisors (see below), whose sum is σ = 50587866732. Its totient is φ = 33725244480.

The previous prime is 42156555587. The next prime is 42156555611. The reversal of 42156555605 is 50655565124.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4635703396 + 37520852209 = 68086^2 + 193703^2 .

It is not a de Polignac number, because 42156555605 - 2¹⁰ = 42156554581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4215655556 + ... + 4215655565.

It is an arithmetic number, because the mean of its divisors is an integer number (12646966683).

Almost surely, 2^42156555605 is an apocalyptic number.

It is an amenable number.

42156555605 is a deficient number, since it is larger than the sum of its proper divisors (8431311127).

42156555605 is an equidigital number, since it uses as much as digits as its factorization.

42156555605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8431311126.

The product of its (nonzero) digits is 900000, while the sum is 44.

The spelling of 42156555605 in words is "forty-two billion, one hundred fifty-six million, five hundred fifty-five thousand, six hundred five".