42554065661 has 16 divisors (see below), whose sum is σ = 45734077440. Its totient is φ = 39451626240.

The previous prime is 42554065657. The next prime is 42554065669. The reversal of 42554065661 is 16656045524.

It is a cyclic number.

It is not a de Polignac number, because 42554065661 - 2² = 42554065657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42554065669) 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, 542075 + ... + 615591.

It is an arithmetic number, because the mean of its divisors is an integer number (2858379840).

Almost surely, 2^42554065661 is an apocalyptic number.

It is an amenable number.

42554065661 is a deficient number, since it is larger than the sum of its proper divisors (3180011779).

42554065661 is a wasteful number, since it uses less digits than its factorization.

42554065661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74044.

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 42554065661 in words is "forty-two billion, five hundred fifty-four million, sixty-five thousand, six hundred sixty-one".