642557164311 has 16 divisors (see below), whose sum is σ = 961750322400. Its totient is φ = 423955240704.

The previous prime is 642557164297. The next prime is 642557164349. The reversal of 642557164311 is 113461755246.

It is a happy number.

642557164311 is a `hidden beast` number, since 6 + 4 + 2 + 5 + 571 + 64 + 3 + 11 = 666.

It is not a de Polignac number, because 642557164311 - 2¹¹ = 642557162263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642557164351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122669616 + ... + 122674853.

It is an arithmetic number, because the mean of its divisors is an integer number (60109395150).

Almost surely, 2^642557164311 is an apocalyptic number.

642557164311 is a deficient number, since it is larger than the sum of its proper divisors (319193158089).

642557164311 is a wasteful number, since it uses less digits than its factorization.

642557164311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245344575 (or 245344569 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The spelling of 642557164311 in words is "six hundred forty-two billion, five hundred fifty-seven million, one hundred sixty-four thousand, three hundred eleven".