646081071 has 8 divisors (see below), whose sum is σ = 861558960. Its totient is φ = 430661952.

The previous prime is 646081057. The next prime is 646081081. The reversal of 646081071 is 170180646.

It is a happy number.

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

It is not a de Polignac number, because 646081071 - 2⁷ = 646080943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646081001) 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, 34341 + ... + 49713.

It is an arithmetic number, because the mean of its divisors is an integer number (107694870).

Almost surely, 2^646081071 is an apocalyptic number.

646081071 is a deficient number, since it is larger than the sum of its proper divisors (215477889).

646081071 is a wasteful number, since it uses less digits than its factorization.

646081071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29385.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 646081071 is about 25418.1248521601. The cubic root of 646081071 is about 864.4947079526.

The spelling of 646081071 in words is "six hundred forty-six million, eighty-one thousand, seventy-one".