42771661 has 8 divisors (see below), whose sum is σ = 44812544. Its totient is φ = 40772160.

The previous prime is 42771653. The next prime is 42771671. The reversal of 42771661 is 16617724.

It is a happy number.

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 42771661 - 2³ = 42771653 is a prime.

It is a super-3 number, since 3×42771661³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42771601) 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, 8220 + ... + 12373.

It is an arithmetic number, because the mean of its divisors is an integer number (5601568).

Almost surely, 2^42771661 is an apocalyptic number.

It is an amenable number.

42771661 is a deficient number, since it is larger than the sum of its proper divisors (2040883).

42771661 is a wasteful number, since it uses less digits than its factorization.

42771661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20691.

The product of its digits is 14112, while the sum is 34.

The square root of 42771661 is about 6540.0046636069. The cubic root of 42771661 is about 349.7185792238.

The spelling of 42771661 in words is "forty-two million, seven hundred seventy-one thousand, six hundred sixty-one".