42661646 has 4 divisors (see below), whose sum is σ = 63992472. Its totient is φ = 21330822.

The previous prime is 42661643. The next prime is 42661651. The reversal of 42661646 is 64616624.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42661643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665410 + ... + 10665413.

It is an arithmetic number, because the mean of its divisors is an integer number (15998118).

Almost surely, 2^42661646 is an apocalyptic number.

42661646 is a deficient number, since it is larger than the sum of its proper divisors (21330826).

42661646 is a wasteful number, since it uses less digits than its factorization.

42661646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21330825.

The product of its digits is 41472, while the sum is 35.

The square root of 42661646 is about 6531.5883213809. The cubic root of 42661646 is about 349.4184792434.

The spelling of 42661646 in words is "forty-two million, six hundred sixty-one thousand, six hundred forty-six".