640827093081 has 16 divisors (see below), whose sum is σ = 976509926784. Its totient is φ = 366182598144.

The previous prime is 640827093073. The next prime is 640827093119. The reversal of 640827093081 is 180390728046.

It is not a de Polignac number, because 640827093081 - 2³ = 640827093073 is a prime.

It is a super-2 number, since 2×640827093081² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 640827093081.

It is not an unprimeable number, because it can be changed into a prime (640827095081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2779435 + ... + 3001151.

It is an arithmetic number, because the mean of its divisors is an integer number (61031870424).

Almost surely, 2^640827093081 is an apocalyptic number.

It is an amenable number.

640827093081 is a deficient number, since it is larger than the sum of its proper divisors (335682833703).

640827093081 is a wasteful number, since it uses less digits than its factorization.

640827093081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359360.

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 640827093081 in words is "six hundred forty billion, eight hundred twenty-seven million, ninety-three thousand, eighty-one".