42542406461 has 4 divisors (see below), whose sum is σ = 42553544124. Its totient is φ = 42531268800.

The previous prime is 42542406419. The next prime is 42542406479. The reversal of 42542406461 is 16460424524.

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 21688158361 + 20854248100 = 147269^2 + 144410^2 .

It is a cyclic number.

It is not a de Polignac number, because 42542406461 - 2⁶ = 42542406397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42542406161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5563100 + ... + 5570741.

It is an arithmetic number, because the mean of its divisors is an integer number (10638386031).

Almost surely, 2^42542406461 is an apocalyptic number.

It is an amenable number.

42542406461 is a deficient number, since it is larger than the sum of its proper divisors (11137663).

42542406461 is a wasteful number, since it uses less digits than its factorization.

42542406461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11137662.

The product of its (nonzero) digits is 184320, while the sum is 38.

The spelling of 42542406461 in words is "forty-two billion, five hundred forty-two million, four hundred six thousand, four hundred sixty-one".