42256561234 has 4 divisors (see below), whose sum is σ = 63384841854. Its totient is φ = 21128280616.

The previous prime is 42256561223. The next prime is 42256561301. The reversal of 42256561234 is 43216565224.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 21534095025 + 20722466209 = 146745^2 + 143953^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10564140307 + ... + 10564140310.

Almost surely, 2^42256561234 is an apocalyptic number.

42256561234 is a deficient number, since it is larger than the sum of its proper divisors (21128280620).

42256561234 is a wasteful number, since it uses less digits than its factorization.

42256561234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21128280619.

The product of its digits is 345600, while the sum is 40.

The spelling of 42256561234 in words is "forty-two billion, two hundred fifty-six million, five hundred sixty-one thousand, two hundred thirty-four".