640227550771 has 16 divisors (see below), whose sum is σ = 679124487168. Its totient is φ = 601468518400.

The previous prime is 640227550717. The next prime is 640227550783. The reversal of 640227550771 is 177055722046.

It is a cyclic number.

It is not a de Polignac number, because 640227550771 - 2³¹ = 638080067123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640227520771) 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, 72493326 + ... + 72502156.

It is an arithmetic number, because the mean of its divisors is an integer number (42445280448).

Almost surely, 2^640227550771 is an apocalyptic number.

640227550771 is a deficient number, since it is larger than the sum of its proper divisors (38896936397).

640227550771 is a wasteful number, since it uses less digits than its factorization.

640227550771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16142.

The product of its (nonzero) digits is 823200, while the sum is 46.

The spelling of 640227550771 in words is "six hundred forty billion, two hundred twenty-seven million, five hundred fifty thousand, seven hundred seventy-one".