42550661 has 8 divisors (see below), whose sum is σ = 43862784. Its totient is φ = 41251680.

The previous prime is 42550649. The next prime is 42550687. The reversal of 42550661 is 16605524.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42550661 - 2⁶ = 42550597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42550601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3500 + ... + 9866.

It is an arithmetic number, because the mean of its divisors is an integer number (5482848).

Almost surely, 2^42550661 is an apocalyptic number.

42550661 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42550661 is a deficient number, since it is larger than the sum of its proper divisors (1312123).

42550661 is a wasteful number, since it uses less digits than its factorization.

42550661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6571.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 42550661 is about 6523.0867693140. The cubic root of 42550661 is about 349.1152100592.

The spelling of 42550661 in words is "forty-two million, five hundred fifty thousand, six hundred sixty-one".