646076557271 has 4 divisors (see below), whose sum is σ = 646078260072. Its totient is φ = 646074854472.

The previous prime is 646076557253. The next prime is 646076557279. The reversal of 646076557271 is 172755670646.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 646076557271 - 2³⁸ = 371198650327 is a prime.

It is a super-3 number, since 3×646076557271³ (a number of 36 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 (646076557279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4616 + ... + 1136738.

It is an arithmetic number, because the mean of its divisors is an integer number (161519565018).

Almost surely, 2^646076557271 is an apocalyptic number.

646076557271 is a deficient number, since it is larger than the sum of its proper divisors (1702801).

646076557271 is a wasteful number, since it uses less digits than its factorization.

646076557271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702800.

The product of its (nonzero) digits is 14817600, while the sum is 56.

The spelling of 646076557271 in words is "six hundred forty-six billion, seventy-six million, five hundred fifty-seven thousand, two hundred seventy-one".